No upstream commit exists for this patch.
Fuzzing of 5.10 stable branch reports a slab-out-of-bounds error in ata_scsi_pass_thru.
The error is fixed in 5.18 by commit ce70fd9a551a ("scsi: core: Remove the cmd field from struct scsi_request") upstream. Backporting this commit would require significant changes to the code so it is bettter to use a simple fix for that particular error.
The problem is that the length of the received SCSI command is not validated if scsi_op == VARIABLE_LENGTH_CMD. It can lead to out-of-bounds reading if the user sends a request with SCSI command of length less than 32.
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Signed-off-by: Artem Sadovnikov ancowi69@gmail.com Signed-off-by: Mikhail Ivanov iwanov-23@bk.ru Signed-off-by: Mikhail Ukhin mish.uxin2012@yandex.ru --- v2: The new addresses were added and the text was updated. drivers/ata/libata-scsi.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index dfa090ccd21c..77589e911d3d 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -4065,6 +4065,9 @@ int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev)
if (unlikely(!scmd->cmd_len)) goto bad_cdb_len; + + if (scsi_op == VARIABLE_LENGTH_CMD && scmd->cmd_len < 32) + goto bad_cdb_len;
if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) { if (unlikely(scmd->cmd_len > dev->cdb_len))