[PATCH 4.19 03/64] scsi: sg: add sg_remove_request in sg_common_write

From: Greg Kroah-Hartman
Date: Wed Apr 22 2020 - 06:13:56 EST


From: Li Bin <huawei.libin@xxxxxxxxxx>

commit 849f8583e955dbe3a1806e03ecacd5e71cce0a08 upstream.

If the dxfer_len is greater than 256M then the request is invalid and we
need to call sg_remove_request in sg_common_write.

Link: https://lore.kernel.org/r/1586777361-17339-1-git-send-email-huawei.libin@xxxxxxxxxx
Fixes: f930c7043663 ("scsi: sg: only check for dxfer_len greater than 256M")
Acked-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
Signed-off-by: Li Bin <huawei.libin@xxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/scsi/sg.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -808,8 +808,10 @@ sg_common_write(Sg_fd * sfp, Sg_request
"sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
(int) cmnd[0], (int) hp->cmd_len));

- if (hp->dxfer_len >= SZ_256M)
+ if (hp->dxfer_len >= SZ_256M) {
+ sg_remove_request(sfp, srp);
return -EINVAL;
+ }

k = sg_start_req(srp, cmnd);
if (k) {