6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Martin Wilck <mwilck@xxxxxxxx>
commit f81eaf08385ddd474a2f41595a7757502870c0eb upstream.
Ff the device returns page 0xb1 with length 8 (happens with qemu v2.x, for
example), sd_read_block_characteristics() may attempt an out-of-bounds
memory access when accessing the zoned field at offset 8.
Fixes: 7fb019c46eee ("scsi: sd: Switch to using scsi_device VPD pages")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Martin Wilck <mwilck@xxxxxxxx>
Link: https://lore.kernel.org/r/20240912134308.282824-1-mwilck@xxxxxxxx
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/sd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3118,7 +3118,7 @@ static void sd_read_block_characteristic
rcu_read_lock();
vpd = rcu_dereference(sdkp->device->vpd_pgb1);
- if (!vpd || vpd->len < 8) {
+ if (!vpd || vpd->len <= 8) {
rcu_read_unlock();
return;
}
