This is a note to let you know that I've just added the patch titled
iscsi-target: fix memory leak in iscsit_setup_text_cmd()
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iscsi-target-fix-memory-leak-in-iscsit_setup_text_cmd.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ea8dc5b4cd2195ee582cae28afa4164c6dea1738 Mon Sep 17 00:00:00 2001
From: Varun Prakash <varun@xxxxxxxxxxx>
Date: Sun, 23 Jul 2017 20:03:33 +0530
Subject: iscsi-target: fix memory leak in iscsit_setup_text_cmd()
From: Varun Prakash <varun@xxxxxxxxxxx>
commit ea8dc5b4cd2195ee582cae28afa4164c6dea1738 upstream.
On receiving text request iscsi-target allocates buffer for
payload in iscsit_handle_text_cmd() and assigns buffer pointer
to cmd->text_in_ptr, this buffer is currently freed in
iscsit_release_cmd(), if iscsi-target sets 'C' bit in text
response then it will receive another text request from the
initiator with ttt != 0xffffffff in this case iscsi-target
will find cmd using itt and call iscsit_setup_text_cmd()
which will set cmd->text_in_ptr to NULL without freeing
previously allocated buffer.
This patch fixes this issue by calling kfree(cmd->text_in_ptr)
in iscsit_setup_text_cmd() before assigning NULL to it.
For the first text request cmd->text_in_ptr is NULL as
cmd is memset to 0 in iscsit_allocate_cmd().
Signed-off-by: Varun Prakash <varun@xxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/target/iscsi/iscsi_target.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1996,6 +1996,7 @@ iscsit_setup_text_cmd(struct iscsi_conn
cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
cmd->data_direction = DMA_NONE;
+ kfree(cmd->text_in_ptr);
cmd->text_in_ptr = NULL;
return 0;
Patches currently in stable-queue which might be from varun@xxxxxxxxxxx are
queue-4.4/iscsi-target-fix-memory-leak-in-iscsit_setup_text_cmd.patch