diff options
| author | Len Baker <len.baker@gmx.com> | 2021-09-25 13:42:05 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-09-28 22:54:55 -0400 |
| commit | 568778f5572afd5b30984edd2a4a2c96df8b2b16 (patch) | |
| tree | abce9bbfc180de3ee3dca6f703303f77b751696b | |
| parent | ce580e47e8481047faf296757d747e95464ff71c (diff) | |
scsi: advansys: Prefer struct_size() over open-coded arithmetic
As noted in the "Deprecated Interfaces, Language Features, Attributes, and
Conventions" documentation [1], size calculations (especially
multiplication) should not be performed in memory allocator (or similar)
function arguments due to the risk of them overflowing. This could lead to
values wrapping around and a smaller allocation being made than the caller
was expecting. Using those allocations could lead to linear overflows of
heap memory and other misbehaviors.
Use the struct_size() helper to do the arithmetic instead of the argument
"size + count * size" in the kzalloc() function.
This code was detected with the help of Coccinelle and audited and fixed
manually.
[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments
Link: https://lore.kernel.org/r/20210925114205.11377-1-len.baker@gmx.com
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Len Baker <len.baker@gmx.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/scsi/advansys.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/scsi/advansys.c b/drivers/scsi/advansys.c index ffb391967573..e341b3372482 100644 --- a/drivers/scsi/advansys.c +++ b/drivers/scsi/advansys.c @@ -7477,8 +7477,8 @@ static int asc_build_req(struct asc_board *boardp, struct scsi_cmnd *scp, return ASC_ERROR; } - asc_sg_head = kzalloc(sizeof(asc_scsi_q->sg_head) + - use_sg * sizeof(struct asc_sg_list), GFP_ATOMIC); + asc_sg_head = kzalloc(struct_size(asc_sg_head, sg_list, use_sg), + GFP_ATOMIC); if (!asc_sg_head) { scsi_dma_unmap(scp); set_host_byte(scp, DID_SOFT_ERROR); |