Re: [PATCH] drivers: qcom: rpmh: use struct_size() in kzalloc()
On 1/28/19 11:26 PM, Amit Kucheria wrote: > On Mon, Dec 24, 2018 at 11:52 AM Gustavo A. R. Silva > wrote: >> >> One of the more common cases of allocation size calculations is finding >> the size of a structure that has a zero-sized array at the end, along >> with memory for some number of elements for that array. For example: >> >> struct foo { >> int stuff; >> void *entry[]; >> }; >> >> instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL); >> >> Instead of leaving these open-coded and prone to type mistakes, we can >> now use the new struct_size() helper: >> >> instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL); >> >> This issue was detected with the help of Coccinelle. >> >> Signed-off-by: Gustavo A. R. Silva > > Reviewed-by: Amit Kucheria > Thanks, Amit. -- Gustavo >> --- >> drivers/soc/qcom/rpmh.c | 3 +-- >> 1 file changed, 1 insertion(+), 2 deletions(-) >> >> diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c >> index c7beb6841289..12c057a0b325 100644 >> --- a/drivers/soc/qcom/rpmh.c >> +++ b/drivers/soc/qcom/rpmh.c >> @@ -362,8 +362,7 @@ int rpmh_write_batch(const struct device *dev, enum >> rpmh_state state, >> if (!count) >> return -EINVAL; >> >> - req = kzalloc(sizeof(*req) + count * sizeof(req->rpm_msgs[0]), >> - GFP_ATOMIC); >> + req = kzalloc(struct_size(req, rpm_msgs, count), GFP_ATOMIC); >> if (!req) >> return -ENOMEM; >> req->count = count; >> -- >> 2.17.0 >>
Re: [PATCH] drivers: qcom: rpmh: use struct_size() in kzalloc()
On Mon, Dec 24, 2018 at 11:52 AM Gustavo A. R. Silva wrote: > > One of the more common cases of allocation size calculations is finding > the size of a structure that has a zero-sized array at the end, along > with memory for some number of elements for that array. For example: > > struct foo { > int stuff; > void *entry[]; > }; > > instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL); > > Instead of leaving these open-coded and prone to type mistakes, we can > now use the new struct_size() helper: > > instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL); > > This issue was detected with the help of Coccinelle. > > Signed-off-by: Gustavo A. R. Silva Reviewed-by: Amit Kucheria > --- > drivers/soc/qcom/rpmh.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c > index c7beb6841289..12c057a0b325 100644 > --- a/drivers/soc/qcom/rpmh.c > +++ b/drivers/soc/qcom/rpmh.c > @@ -362,8 +362,7 @@ int rpmh_write_batch(const struct device *dev, enum > rpmh_state state, > if (!count) > return -EINVAL; > > - req = kzalloc(sizeof(*req) + count * sizeof(req->rpm_msgs[0]), > - GFP_ATOMIC); > + req = kzalloc(struct_size(req, rpm_msgs, count), GFP_ATOMIC); > if (!req) > return -ENOMEM; > req->count = count; > -- > 2.17.0 >
Re: [PATCH] drivers: qcom: rpmh: use struct_size() in kzalloc()
Hi all, Friendly ping: Who can take this? Thanks -- Gustavo On 1/9/19 11:38 AM, Gustavo A. R. Silva wrote: > Hi, > > Friendly ping: > > Who can ack or review this patch, please? > > Thanks > -- > Gustavo > > > On 12/24/18 12:22 AM, Gustavo A. R. Silva wrote: >> One of the more common cases of allocation size calculations is finding >> the size of a structure that has a zero-sized array at the end, along >> with memory for some number of elements for that array. For example: >> >> struct foo { >> int stuff; >> void *entry[]; >> }; >> >> instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL); >> >> Instead of leaving these open-coded and prone to type mistakes, we can >> now use the new struct_size() helper: >> >> instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL); >> >> This issue was detected with the help of Coccinelle. >> >> Signed-off-by: Gustavo A. R. Silva >> --- >> drivers/soc/qcom/rpmh.c | 3 +-- >> 1 file changed, 1 insertion(+), 2 deletions(-) >> >> diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c >> index c7beb6841289..12c057a0b325 100644 >> --- a/drivers/soc/qcom/rpmh.c >> +++ b/drivers/soc/qcom/rpmh.c >> @@ -362,8 +362,7 @@ int rpmh_write_batch(const struct device *dev, enum >> rpmh_state state, >> if (!count) >> return -EINVAL; >> - req = kzalloc(sizeof(*req) + count * sizeof(req->rpm_msgs[0]), >> - GFP_ATOMIC); >> + req = kzalloc(struct_size(req, rpm_msgs, count), GFP_ATOMIC); >> if (!req) >> return -ENOMEM; >> req->count = count; >>
Re: [PATCH] drivers: qcom: rpmh: use struct_size() in kzalloc()
Hi, Friendly ping: Who can ack or review this patch, please? Thanks -- Gustavo On 12/24/18 12:22 AM, Gustavo A. R. Silva wrote: One of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example: struct foo { int stuff; void *entry[]; }; instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL); Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL); This issue was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva --- drivers/soc/qcom/rpmh.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c index c7beb6841289..12c057a0b325 100644 --- a/drivers/soc/qcom/rpmh.c +++ b/drivers/soc/qcom/rpmh.c @@ -362,8 +362,7 @@ int rpmh_write_batch(const struct device *dev, enum rpmh_state state, if (!count) return -EINVAL; - req = kzalloc(sizeof(*req) + count * sizeof(req->rpm_msgs[0]), - GFP_ATOMIC); + req = kzalloc(struct_size(req, rpm_msgs, count), GFP_ATOMIC); if (!req) return -ENOMEM; req->count = count;
[PATCH] drivers: qcom: rpmh: use struct_size() in kzalloc()
One of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example: struct foo { int stuff; void *entry[]; }; instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL); Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL); This issue was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva --- drivers/soc/qcom/rpmh.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c index c7beb6841289..12c057a0b325 100644 --- a/drivers/soc/qcom/rpmh.c +++ b/drivers/soc/qcom/rpmh.c @@ -362,8 +362,7 @@ int rpmh_write_batch(const struct device *dev, enum rpmh_state state, if (!count) return -EINVAL; - req = kzalloc(sizeof(*req) + count * sizeof(req->rpm_msgs[0]), - GFP_ATOMIC); + req = kzalloc(struct_size(req, rpm_msgs, count), GFP_ATOMIC); if (!req) return -ENOMEM; req->count = count; -- 2.17.0
Re: [PATCH] drivers: qcom: rpmh: use struct_size() in kzalloc()
On Thu 23 Aug 18:17 PDT 2018, Gustavo A. R. Silva wrote: > One of the more common cases of allocation size calculations is finding > the size of a structure that has a zero-sized array at the end, along > with memory for some number of elements for that array. For example: > > struct foo { > int stuff; > void *entry[]; > }; > > instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_ATOMIC); > > Instead of leaving these open-coded and prone to type mistakes, we can > now use the new struct_size() helper: > > instance = kzalloc(struct_size(instance, entry, count), GFP_ATOMIC); > > This issue was detected with the help of Coccinelle. > > Signed-off-by: Gustavo A. R. Silva Reviewed-by: Bjorn Andersson Regards, Bjorn > --- > drivers/soc/qcom/rpmh.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c > index c7beb68..12c057a 100644 > --- a/drivers/soc/qcom/rpmh.c > +++ b/drivers/soc/qcom/rpmh.c > @@ -362,8 +362,7 @@ int rpmh_write_batch(const struct device *dev, enum > rpmh_state state, > if (!count) > return -EINVAL; > > - req = kzalloc(sizeof(*req) + count * sizeof(req->rpm_msgs[0]), > - GFP_ATOMIC); > + req = kzalloc(struct_size(req, rpm_msgs, count), GFP_ATOMIC); > if (!req) > return -ENOMEM; > req->count = count; > -- > 2.7.4 >
Re: [PATCH] drivers: qcom: rpmh: use struct_size() in kzalloc()
On Thu 23 Aug 18:17 PDT 2018, Gustavo A. R. Silva wrote: > One of the more common cases of allocation size calculations is finding > the size of a structure that has a zero-sized array at the end, along > with memory for some number of elements for that array. For example: > > struct foo { > int stuff; > void *entry[]; > }; > > instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_ATOMIC); > > Instead of leaving these open-coded and prone to type mistakes, we can > now use the new struct_size() helper: > > instance = kzalloc(struct_size(instance, entry, count), GFP_ATOMIC); > > This issue was detected with the help of Coccinelle. > > Signed-off-by: Gustavo A. R. Silva Reviewed-by: Bjorn Andersson Regards, Bjorn > --- > drivers/soc/qcom/rpmh.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c > index c7beb68..12c057a 100644 > --- a/drivers/soc/qcom/rpmh.c > +++ b/drivers/soc/qcom/rpmh.c > @@ -362,8 +362,7 @@ int rpmh_write_batch(const struct device *dev, enum > rpmh_state state, > if (!count) > return -EINVAL; > > - req = kzalloc(sizeof(*req) + count * sizeof(req->rpm_msgs[0]), > - GFP_ATOMIC); > + req = kzalloc(struct_size(req, rpm_msgs, count), GFP_ATOMIC); > if (!req) > return -ENOMEM; > req->count = count; > -- > 2.7.4 >
Re: [PATCH] drivers: qcom: rpmh: use struct_size() in kzalloc()
On Thu, Aug 23, 2018 at 6:17 PM, Gustavo A. R. Silva wrote: > One of the more common cases of allocation size calculations is finding > the size of a structure that has a zero-sized array at the end, along > with memory for some number of elements for that array. For example: > > struct foo { > int stuff; > void *entry[]; > }; > > instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_ATOMIC); > > Instead of leaving these open-coded and prone to type mistakes, we can > now use the new struct_size() helper: > > instance = kzalloc(struct_size(instance, entry, count), GFP_ATOMIC); > > This issue was detected with the help of Coccinelle. > > Signed-off-by: Gustavo A. R. Silva Reviewed-by: Kees Cook -Kees > --- > drivers/soc/qcom/rpmh.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c > index c7beb68..12c057a 100644 > --- a/drivers/soc/qcom/rpmh.c > +++ b/drivers/soc/qcom/rpmh.c > @@ -362,8 +362,7 @@ int rpmh_write_batch(const struct device *dev, enum > rpmh_state state, > if (!count) > return -EINVAL; > > - req = kzalloc(sizeof(*req) + count * sizeof(req->rpm_msgs[0]), > - GFP_ATOMIC); > + req = kzalloc(struct_size(req, rpm_msgs, count), GFP_ATOMIC); > if (!req) > return -ENOMEM; > req->count = count; > -- > 2.7.4 > -- Kees Cook Pixel Security
Re: [PATCH] drivers: qcom: rpmh: use struct_size() in kzalloc()
On Thu, Aug 23, 2018 at 6:17 PM, Gustavo A. R. Silva wrote: > One of the more common cases of allocation size calculations is finding > the size of a structure that has a zero-sized array at the end, along > with memory for some number of elements for that array. For example: > > struct foo { > int stuff; > void *entry[]; > }; > > instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_ATOMIC); > > Instead of leaving these open-coded and prone to type mistakes, we can > now use the new struct_size() helper: > > instance = kzalloc(struct_size(instance, entry, count), GFP_ATOMIC); > > This issue was detected with the help of Coccinelle. > > Signed-off-by: Gustavo A. R. Silva Reviewed-by: Kees Cook -Kees > --- > drivers/soc/qcom/rpmh.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c > index c7beb68..12c057a 100644 > --- a/drivers/soc/qcom/rpmh.c > +++ b/drivers/soc/qcom/rpmh.c > @@ -362,8 +362,7 @@ int rpmh_write_batch(const struct device *dev, enum > rpmh_state state, > if (!count) > return -EINVAL; > > - req = kzalloc(sizeof(*req) + count * sizeof(req->rpm_msgs[0]), > - GFP_ATOMIC); > + req = kzalloc(struct_size(req, rpm_msgs, count), GFP_ATOMIC); > if (!req) > return -ENOMEM; > req->count = count; > -- > 2.7.4 > -- Kees Cook Pixel Security
[PATCH] drivers: qcom: rpmh: use struct_size() in kzalloc()
One of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example: struct foo { int stuff; void *entry[]; }; instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_ATOMIC); Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = kzalloc(struct_size(instance, entry, count), GFP_ATOMIC); This issue was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva --- drivers/soc/qcom/rpmh.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c index c7beb68..12c057a 100644 --- a/drivers/soc/qcom/rpmh.c +++ b/drivers/soc/qcom/rpmh.c @@ -362,8 +362,7 @@ int rpmh_write_batch(const struct device *dev, enum rpmh_state state, if (!count) return -EINVAL; - req = kzalloc(sizeof(*req) + count * sizeof(req->rpm_msgs[0]), - GFP_ATOMIC); + req = kzalloc(struct_size(req, rpm_msgs, count), GFP_ATOMIC); if (!req) return -ENOMEM; req->count = count; -- 2.7.4
[PATCH] drivers: qcom: rpmh: use struct_size() in kzalloc()
One of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example: struct foo { int stuff; void *entry[]; }; instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_ATOMIC); Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = kzalloc(struct_size(instance, entry, count), GFP_ATOMIC); This issue was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva --- drivers/soc/qcom/rpmh.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c index c7beb68..12c057a 100644 --- a/drivers/soc/qcom/rpmh.c +++ b/drivers/soc/qcom/rpmh.c @@ -362,8 +362,7 @@ int rpmh_write_batch(const struct device *dev, enum rpmh_state state, if (!count) return -EINVAL; - req = kzalloc(sizeof(*req) + count * sizeof(req->rpm_msgs[0]), - GFP_ATOMIC); + req = kzalloc(struct_size(req, rpm_msgs, count), GFP_ATOMIC); if (!req) return -ENOMEM; req->count = count; -- 2.7.4