On Fri, Oct 30, 2020 at 05:44:20PM +0100, Arnd Bergmann wrote: > From: Arnd Bergmann <[email protected]> > > It sounds unwise to let user space pass an unchecked 32-bit > offset into a kernel structure in an ioctl. This is an unsigned > variable, so checking the upper bound for the size of the structure > it points into is sufficient to avoid data corruption, but as > the pointer might also be unaligned, it has to be written carefully > as well. > > While I stumbled over this problem by reading the code, I did not > continue checking the function for further problems like it. > > Cc: <[email protected]> # v2.6.15+ > Fixes: c4a3e0a529ab ("[SCSI] MegaRAID SAS RAID: new driver") > Reviewed-by: Christoph Hellwig <[email protected]> > Signed-off-by: Arnd Bergmann <[email protected]> > --- > drivers/scsi/megaraid/megaraid_sas_base.c | 15 ++++++++++----- > 1 file changed, 10 insertions(+), 5 deletions(-) > > diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c > b/drivers/scsi/megaraid/megaraid_sas_base.c > index 41cd66fc7d81..b1b9a8823c8c 100644 > --- a/drivers/scsi/megaraid/megaraid_sas_base.c > +++ b/drivers/scsi/megaraid/megaraid_sas_base.c > @@ -8134,7 +8134,7 @@ megasas_mgmt_fw_ioctl(struct megasas_instance *instance, > int error = 0, i; > void *sense = NULL; > dma_addr_t sense_handle; > - unsigned long *sense_ptr; > + void *sense_ptr; > u32 opcode = 0; > int ret = DCMD_SUCCESS; > > @@ -8257,6 +8257,12 @@ megasas_mgmt_fw_ioctl(struct megasas_instance > *instance, > } > > if (ioc->sense_len) { > + /* make sure the pointer is part of the frame */ > + if (ioc->sense_off > (sizeof(union megasas_frame) - > sizeof(__le64))) { > + error = -EINVAL;
This still has the overly long line.
