This is a note to let you know that I've just added the patch titled
scsi: scsi_debug: Fix a warning in resp_verify()
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-scsi_debug-fix-a-warning-in-resp_verify.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 1dd417331f4be9b645ae625fb7683fd168178a1e
Author: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>
Date: Fri Nov 11 23:00:31 2022 -0800
scsi: scsi_debug: Fix a warning in resp_verify()
[ Upstream commit ed0f17b748b20271cb568c7ca0b23b120316a47d ]
As 'vnum' is controlled by user, so if user tries to allocate memory larger
than(>=) MAX_ORDER, then kcalloc() will fail, it creates a stack trace and
messes up dmesg with a warning.
Add __GFP_NOWARN in order to avoid too large allocation warning. This is
detected by static analysis using smatch.
Fixes: c3e2fe9222d4 ("scsi: scsi_debug: Implement VERIFY(10), add VERIFY(16)")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221112070031.2121068-1-harshit.m.mogalapalli@xxxxxxxxxx
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 110d0e7f9413..cdbcb5eaf279 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -4275,7 +4275,7 @@ static int resp_verify(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
if (ret)
return ret;
- arr = kcalloc(lb_size, vnum, GFP_ATOMIC);
+ arr = kcalloc(lb_size, vnum, GFP_ATOMIC | __GFP_NOWARN);
if (!arr) {
mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC,
INSUFF_RES_ASCQ);
