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authorArnd Bergmann <arnd@arndb.de>2018-11-02 18:34:49 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2018-11-06 06:35:01 +0300
commitf8f4adc1c1661686f492cf27817844a3d0517aff (patch)
treed780c8d123ea82c824a06a674efd7913b382cd1d /drivers/scsi/myrb.c
parent5841734fa6f997e57e8c29cbb6409bd74a6949e8 (diff)
downloadlinux-f8f4adc1c1661686f492cf27817844a3d0517aff.tar.xz
scsi: myrb: fix sprintf buffer overflow warning
gcc warns that the 12 byte fw_version field might not be long enough to contain the generated firmware name string: drivers/scsi/myrb.c: In function 'myrb_get_hba_config': drivers/scsi/myrb.c:1052:38: error: '%02d' directive writing between 2 and 3 bytes into a region of size between 2 and 5 [-Werror=format-overflow=] sprintf(cb->fw_version, "%d.%02d-%c-%02d", ^~~~ drivers/scsi/myrb.c:1052:26: note: directive argument in the range [0, 255] sprintf(cb->fw_version, "%d.%02d-%c-%02d", ^~~~~~~~~~~~~~~~~ drivers/scsi/myrb.c:1052:2: note: 'sprintf' output between 10 and 14 bytes into a destination of size 12 sprintf(cb->fw_version, "%d.%02d-%c-%02d", ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ enquiry2->fw.major_version, ~~~~~~~~~~~~~~~~~~~~~~~~~~~ enquiry2->fw.minor_version, ~~~~~~~~~~~~~~~~~~~~~~~~~~~ enquiry2->fw.firmware_type, ~~~~~~~~~~~~~~~~~~~~~~~~~~~ enquiry2->fw.turn_id); ~~~~~~~~~~~~~~~~~~~~~ I have not checked whether there are appropriate range checks before the sprintf, but there is a range check after it that will bail out in case of out of range version numbers. This means we can simply use snprintf() instead of sprintf() to limit the output buffer size, and it will work correctly. Fixes: 081ff398c56c ("scsi: myrb: Add Mylex RAID controller (block interface)") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/myrb.c')
-rw-r--r--drivers/scsi/myrb.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/scsi/myrb.c b/drivers/scsi/myrb.c
index aeb282f617c5..0642f2d0a3bb 100644
--- a/drivers/scsi/myrb.c
+++ b/drivers/scsi/myrb.c
@@ -1049,7 +1049,8 @@ static int myrb_get_hba_config(struct myrb_hba *cb)
enquiry2->fw.firmware_type = '0';
enquiry2->fw.turn_id = 0;
}
- sprintf(cb->fw_version, "%d.%02d-%c-%02d",
+ snprintf(cb->fw_version, sizeof(cb->fw_version),
+ "%d.%02d-%c-%02d",
enquiry2->fw.major_version,
enquiry2->fw.minor_version,
enquiry2->fw.firmware_type,