[PATCH 6.0 0623/1073] scsi: scsi_debug: Fix a warning in resp_report_zones()

Greg Kroah-Hartman
2022-12-28T16:12:42Z

From: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>

[ Upstream commit 07f2ca139d9a7a1ba71c4c03997c8de161db2346 ]

As 'alloc_len' is user controlled data, 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: 7db0e0c8190a ("scsi: scsi_debug: Fix buffer size of REPORT ZONES command")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Link: https://lore.kernel.org/r/20221112070612.2121535-1-harshit.m.mogalapalli@oracle.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/scsi_debug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 077782eb55e7..3452fef3f749 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -4504,7 +4504,7 @@ static int resp_report_zones(struct scsi_cmnd *scp,

rep_max_zones = (alloc_len - 64) >> ilog2(RZONES_DESC_HD);

- arr = kzalloc(alloc_len, GFP_ATOMIC);
+ arr = kzalloc(alloc_len, GFP_ATOMIC | __GFP_NOWARN);
if (!arr) {
mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC,
INSUFF_RES_ASCQ);
--
2.35.1