[PATCH 1/2] [CIFS] possible memory corruption on mount

[Jeff Layton]

From: Steve French <sfrench(a)us.ibm.com&gt;

CIFS cleanup_volume_info_contents() looks like having a memory
corruption problem.
When UNCip is set to "&vol->UNC[2]" in cifs_parse_mount_options(), it
should not be kfree()-ed in cleanup_volume_info_contents().

Introduced in commit b946845a9dc523c759cae2b6a0f6827486c3221a

Signed-off-by: J.R. Okajima <hooanon05(a)yahoo.co.jp&gt;
Reviewed-by: Jeff Layton <jlayton(a)redhat.com&gt;
CC: Stable <stable(a)kernel.org&gt;
Signed-off-by: Steve French <sfrench(a)us.ibm.com&gt;
---
 fs/cifs/connect.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index ccc1afa..e0ea721 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2838,7 +2838,8 @@ cleanup_volume_info_contents(struct smb_vol *volume_info)
 	kfree(volume_info->username);
 	kzfree(volume_info->password);
 	kfree(volume_info->UNC);
-	kfree(volume_info->UNCip);
+	if (volume_info->UNCip != volume_info->UNC + 2)
+		kfree(volume_info->UNCip);
 	kfree(volume_info->domainname);
 	kfree(volume_info->iocharset);
 	kfree(volume_info->prepath);
-- 
1.7.6