Re: [PATCH] xen-blkfront: use a right index when checking requests
On Wed, Aug 09, 2017 at 03:31:40PM -0700, Munehisa Kamata wrote: > Since commit d05d7f40791c ("Merge branch 'for-4.8/core' of > git://git.kernel.dk/linux-block") and 3fc9d690936f ("Merge branch > 'for-4.8/drivers' of git://git.kernel.dk/linux-block"), blkfront_resume() > has been using an index for iterating ring_info to check request when > iterating blk_shadow in an inner loop. This seems to have been > accidentally introduced during the massive rewrite of the block layer > macros in the commits. > > This may cause crash like this: > > [11798.057074] BUG: unable to handle kernel NULL pointer dereference at > 0048 > [11798.058832] IP: [] blkfront_resume+0x10a/0x610 > > [11798.061063] Call Trace: > [11798.061063] [] xenbus_dev_resume+0x53/0x140 > [11798.061063] [] ? xenbus_dev_probe+0x150/0x150 > [11798.061063] [] dpm_run_callback+0x3e/0x110 > [11798.061063] [] device_resume+0x88/0x190 > [11798.061063] [] dpm_resume+0x100/0x2d0 > [11798.061063] [] dpm_resume_end+0x11/0x20 > [11798.061063] [] do_suspend+0xe8/0x1a0 > [11798.061063] [] shutdown_handler+0xfd/0x130 > [11798.061063] [] ? split+0x110/0x110 > [11798.061063] [] xenwatch_thread+0x86/0x120 > [11798.061063] [] ? prepare_to_wait_event+0x110/0x110 > [11798.061063] [] kthread+0xd7/0xf0 > [11798.061063] [] ? kfree+0x121/0x170 > [11798.061063] [] ? kthread_park+0x60/0x60 > [11798.061063] [] ? > call_usermodehelper_exec_work+0xb0/0xb0 > [11798.061063] [] ? > call_usermodehelper_exec_async+0x13a/0x140 > [11798.061063] [] ret_from_fork+0x25/0x30 > > Use the right index in the inner loop. > > Fixes: d05d7f40791c ("Merge branch 'for-4.8/core' of > git://git.kernel.dk/linux-block") > Fixes: 3fc9d690936f ("Merge branch 'for-4.8/drivers' of > git://git.kernel.dk/linux-block") > Signed-off-by: Munehisa Kamata> Reviewed-by: Thomas Friebel > Reviewed-by: Eduardo Valentin > Cc: Boris Ostrovsky > Cc: Juergen Gross > Cc: Konrad Rzeszutek Wilk > Cc: Roger Pau Monne > Cc: xen-de...@lists.xenproject.org > Cc: sta...@vger.kernel.org Reviewed-by: Roger Pau Monné Thanks, Roger.
Re: [PATCH] xen-blkfront: use a right index when checking requests
On Wed, Aug 09, 2017 at 03:31:40PM -0700, Munehisa Kamata wrote: > Since commit d05d7f40791c ("Merge branch 'for-4.8/core' of > git://git.kernel.dk/linux-block") and 3fc9d690936f ("Merge branch > 'for-4.8/drivers' of git://git.kernel.dk/linux-block"), blkfront_resume() > has been using an index for iterating ring_info to check request when > iterating blk_shadow in an inner loop. This seems to have been > accidentally introduced during the massive rewrite of the block layer > macros in the commits. > > This may cause crash like this: > > [11798.057074] BUG: unable to handle kernel NULL pointer dereference at > 0048 > [11798.058832] IP: [] blkfront_resume+0x10a/0x610 > > [11798.061063] Call Trace: > [11798.061063] [] xenbus_dev_resume+0x53/0x140 > [11798.061063] [] ? xenbus_dev_probe+0x150/0x150 > [11798.061063] [] dpm_run_callback+0x3e/0x110 > [11798.061063] [] device_resume+0x88/0x190 > [11798.061063] [] dpm_resume+0x100/0x2d0 > [11798.061063] [] dpm_resume_end+0x11/0x20 > [11798.061063] [] do_suspend+0xe8/0x1a0 > [11798.061063] [] shutdown_handler+0xfd/0x130 > [11798.061063] [] ? split+0x110/0x110 > [11798.061063] [] xenwatch_thread+0x86/0x120 > [11798.061063] [] ? prepare_to_wait_event+0x110/0x110 > [11798.061063] [] kthread+0xd7/0xf0 > [11798.061063] [] ? kfree+0x121/0x170 > [11798.061063] [] ? kthread_park+0x60/0x60 > [11798.061063] [] ? > call_usermodehelper_exec_work+0xb0/0xb0 > [11798.061063] [] ? > call_usermodehelper_exec_async+0x13a/0x140 > [11798.061063] [] ret_from_fork+0x25/0x30 > > Use the right index in the inner loop. > > Fixes: d05d7f40791c ("Merge branch 'for-4.8/core' of > git://git.kernel.dk/linux-block") > Fixes: 3fc9d690936f ("Merge branch 'for-4.8/drivers' of > git://git.kernel.dk/linux-block") > Signed-off-by: Munehisa Kamata > Reviewed-by: Thomas Friebel > Reviewed-by: Eduardo Valentin > Cc: Boris Ostrovsky > Cc: Juergen Gross > Cc: Konrad Rzeszutek Wilk > Cc: Roger Pau Monne > Cc: xen-de...@lists.xenproject.org > Cc: sta...@vger.kernel.org Reviewed-by: Roger Pau Monné Thanks, Roger.
Re: [PATCH] xen-blkfront: use a right index when checking requests
On 08/09/2017 06:31 PM, Munehisa Kamata wrote: Since commit d05d7f40791c ("Merge branch 'for-4.8/core' of git://git.kernel.dk/linux-block") and 3fc9d690936f ("Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block"), blkfront_resume() has been using an index for iterating ring_info to check request when iterating blk_shadow in an inner loop. This seems to have been accidentally introduced during the massive rewrite of the block layer macros in the commits. This may cause crash like this: [11798.057074] BUG: unable to handle kernel NULL pointer dereference at 0048 [11798.058832] IP: [] blkfront_resume+0x10a/0x610 [11798.061063] Call Trace: [11798.061063] [] xenbus_dev_resume+0x53/0x140 [11798.061063] [] ? xenbus_dev_probe+0x150/0x150 [11798.061063] [] dpm_run_callback+0x3e/0x110 [11798.061063] [] device_resume+0x88/0x190 [11798.061063] [] dpm_resume+0x100/0x2d0 [11798.061063] [] dpm_resume_end+0x11/0x20 [11798.061063] [] do_suspend+0xe8/0x1a0 [11798.061063] [] shutdown_handler+0xfd/0x130 [11798.061063] [] ? split+0x110/0x110 [11798.061063] [] xenwatch_thread+0x86/0x120 [11798.061063] [] ? prepare_to_wait_event+0x110/0x110 [11798.061063] [] kthread+0xd7/0xf0 [11798.061063] [] ? kfree+0x121/0x170 [11798.061063] [] ? kthread_park+0x60/0x60 [11798.061063] [] ? call_usermodehelper_exec_work+0xb0/0xb0 [11798.061063] [] ? call_usermodehelper_exec_async+0x13a/0x140 [11798.061063] [] ret_from_fork+0x25/0x30 Use the right index in the inner loop. Fixes: d05d7f40791c ("Merge branch 'for-4.8/core' of git://git.kernel.dk/linux-block") Fixes: 3fc9d690936f ("Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block") Signed-off-by: Munehisa KamataReviewed-by: Thomas Friebel Reviewed-by: Eduardo Valentin Cc: Boris Ostrovsky Cc: Juergen Gross Cc: Konrad Rzeszutek Wilk Cc: Roger Pau Monne Cc: xen-de...@lists.xenproject.org Cc: sta...@vger.kernel.org Reviewed-by: Boris Ostrovsky
Re: [PATCH] xen-blkfront: use a right index when checking requests
On 08/09/2017 06:31 PM, Munehisa Kamata wrote: Since commit d05d7f40791c ("Merge branch 'for-4.8/core' of git://git.kernel.dk/linux-block") and 3fc9d690936f ("Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block"), blkfront_resume() has been using an index for iterating ring_info to check request when iterating blk_shadow in an inner loop. This seems to have been accidentally introduced during the massive rewrite of the block layer macros in the commits. This may cause crash like this: [11798.057074] BUG: unable to handle kernel NULL pointer dereference at 0048 [11798.058832] IP: [] blkfront_resume+0x10a/0x610 [11798.061063] Call Trace: [11798.061063] [] xenbus_dev_resume+0x53/0x140 [11798.061063] [] ? xenbus_dev_probe+0x150/0x150 [11798.061063] [] dpm_run_callback+0x3e/0x110 [11798.061063] [] device_resume+0x88/0x190 [11798.061063] [] dpm_resume+0x100/0x2d0 [11798.061063] [] dpm_resume_end+0x11/0x20 [11798.061063] [] do_suspend+0xe8/0x1a0 [11798.061063] [] shutdown_handler+0xfd/0x130 [11798.061063] [] ? split+0x110/0x110 [11798.061063] [] xenwatch_thread+0x86/0x120 [11798.061063] [] ? prepare_to_wait_event+0x110/0x110 [11798.061063] [] kthread+0xd7/0xf0 [11798.061063] [] ? kfree+0x121/0x170 [11798.061063] [] ? kthread_park+0x60/0x60 [11798.061063] [] ? call_usermodehelper_exec_work+0xb0/0xb0 [11798.061063] [] ? call_usermodehelper_exec_async+0x13a/0x140 [11798.061063] [] ret_from_fork+0x25/0x30 Use the right index in the inner loop. Fixes: d05d7f40791c ("Merge branch 'for-4.8/core' of git://git.kernel.dk/linux-block") Fixes: 3fc9d690936f ("Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block") Signed-off-by: Munehisa Kamata Reviewed-by: Thomas Friebel Reviewed-by: Eduardo Valentin Cc: Boris Ostrovsky Cc: Juergen Gross Cc: Konrad Rzeszutek Wilk Cc: Roger Pau Monne Cc: xen-de...@lists.xenproject.org Cc: sta...@vger.kernel.org Reviewed-by: Boris Ostrovsky
[PATCH] xen-blkfront: use a right index when checking requests
Since commit d05d7f40791c ("Merge branch 'for-4.8/core' of git://git.kernel.dk/linux-block") and 3fc9d690936f ("Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block"), blkfront_resume() has been using an index for iterating ring_info to check request when iterating blk_shadow in an inner loop. This seems to have been accidentally introduced during the massive rewrite of the block layer macros in the commits. This may cause crash like this: [11798.057074] BUG: unable to handle kernel NULL pointer dereference at 0048 [11798.058832] IP: [] blkfront_resume+0x10a/0x610 [11798.061063] Call Trace: [11798.061063] [] xenbus_dev_resume+0x53/0x140 [11798.061063] [] ? xenbus_dev_probe+0x150/0x150 [11798.061063] [] dpm_run_callback+0x3e/0x110 [11798.061063] [] device_resume+0x88/0x190 [11798.061063] [] dpm_resume+0x100/0x2d0 [11798.061063] [] dpm_resume_end+0x11/0x20 [11798.061063] [] do_suspend+0xe8/0x1a0 [11798.061063] [] shutdown_handler+0xfd/0x130 [11798.061063] [] ? split+0x110/0x110 [11798.061063] [] xenwatch_thread+0x86/0x120 [11798.061063] [] ? prepare_to_wait_event+0x110/0x110 [11798.061063] [] kthread+0xd7/0xf0 [11798.061063] [] ? kfree+0x121/0x170 [11798.061063] [] ? kthread_park+0x60/0x60 [11798.061063] [] ? call_usermodehelper_exec_work+0xb0/0xb0 [11798.061063] [] ? call_usermodehelper_exec_async+0x13a/0x140 [11798.061063] [] ret_from_fork+0x25/0x30 Use the right index in the inner loop. Fixes: d05d7f40791c ("Merge branch 'for-4.8/core' of git://git.kernel.dk/linux-block") Fixes: 3fc9d690936f ("Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block") Signed-off-by: Munehisa KamataReviewed-by: Thomas Friebel Reviewed-by: Eduardo Valentin Cc: Boris Ostrovsky Cc: Juergen Gross Cc: Konrad Rzeszutek Wilk Cc: Roger Pau Monne Cc: xen-de...@lists.xenproject.org Cc: sta...@vger.kernel.org --- drivers/block/xen-blkfront.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 98e34e4c62b8..2468c28d4771 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -2075,9 +2075,9 @@ static int blkfront_resume(struct xenbus_device *dev) /* * Get the bios in the request so we can re-queue them. */ - if (req_op(shadow[i].request) == REQ_OP_FLUSH || - req_op(shadow[i].request) == REQ_OP_DISCARD || - req_op(shadow[i].request) == REQ_OP_SECURE_ERASE || + if (req_op(shadow[j].request) == REQ_OP_FLUSH || + req_op(shadow[j].request) == REQ_OP_DISCARD || + req_op(shadow[j].request) == REQ_OP_SECURE_ERASE || shadow[j].request->cmd_flags & REQ_FUA) { /* * Flush operations don't contain bios, so -- 2.13.0
[PATCH] xen-blkfront: use a right index when checking requests
Since commit d05d7f40791c ("Merge branch 'for-4.8/core' of git://git.kernel.dk/linux-block") and 3fc9d690936f ("Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block"), blkfront_resume() has been using an index for iterating ring_info to check request when iterating blk_shadow in an inner loop. This seems to have been accidentally introduced during the massive rewrite of the block layer macros in the commits. This may cause crash like this: [11798.057074] BUG: unable to handle kernel NULL pointer dereference at 0048 [11798.058832] IP: [] blkfront_resume+0x10a/0x610 [11798.061063] Call Trace: [11798.061063] [] xenbus_dev_resume+0x53/0x140 [11798.061063] [] ? xenbus_dev_probe+0x150/0x150 [11798.061063] [] dpm_run_callback+0x3e/0x110 [11798.061063] [] device_resume+0x88/0x190 [11798.061063] [] dpm_resume+0x100/0x2d0 [11798.061063] [] dpm_resume_end+0x11/0x20 [11798.061063] [] do_suspend+0xe8/0x1a0 [11798.061063] [] shutdown_handler+0xfd/0x130 [11798.061063] [] ? split+0x110/0x110 [11798.061063] [] xenwatch_thread+0x86/0x120 [11798.061063] [] ? prepare_to_wait_event+0x110/0x110 [11798.061063] [] kthread+0xd7/0xf0 [11798.061063] [] ? kfree+0x121/0x170 [11798.061063] [] ? kthread_park+0x60/0x60 [11798.061063] [] ? call_usermodehelper_exec_work+0xb0/0xb0 [11798.061063] [] ? call_usermodehelper_exec_async+0x13a/0x140 [11798.061063] [] ret_from_fork+0x25/0x30 Use the right index in the inner loop. Fixes: d05d7f40791c ("Merge branch 'for-4.8/core' of git://git.kernel.dk/linux-block") Fixes: 3fc9d690936f ("Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block") Signed-off-by: Munehisa Kamata Reviewed-by: Thomas Friebel Reviewed-by: Eduardo Valentin Cc: Boris Ostrovsky Cc: Juergen Gross Cc: Konrad Rzeszutek Wilk Cc: Roger Pau Monne Cc: xen-de...@lists.xenproject.org Cc: sta...@vger.kernel.org --- drivers/block/xen-blkfront.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 98e34e4c62b8..2468c28d4771 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -2075,9 +2075,9 @@ static int blkfront_resume(struct xenbus_device *dev) /* * Get the bios in the request so we can re-queue them. */ - if (req_op(shadow[i].request) == REQ_OP_FLUSH || - req_op(shadow[i].request) == REQ_OP_DISCARD || - req_op(shadow[i].request) == REQ_OP_SECURE_ERASE || + if (req_op(shadow[j].request) == REQ_OP_FLUSH || + req_op(shadow[j].request) == REQ_OP_DISCARD || + req_op(shadow[j].request) == REQ_OP_SECURE_ERASE || shadow[j].request->cmd_flags & REQ_FUA) { /* * Flush operations don't contain bios, so -- 2.13.0