Commit 51fce08b authored by Pavel Shilovsky's avatar Pavel Shilovsky Committed by Sasha Levin

CIFS: Fix a possible memory corruption in push locks

[ Upstream commit e3d240e9 ]

If maxBuf is not 0 but less than a size of SMB2 lock structure
we can end up with a memory corruption.

Cc: Stable <stable@vger.kernel.org>
Signed-off-by: default avatarPavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent 7f167691
...@@ -241,7 +241,7 @@ smb2_push_mandatory_locks(struct cifsFileInfo *cfile) ...@@ -241,7 +241,7 @@ smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
* and check it for zero before using. * and check it for zero before using.
*/ */
max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf; max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
if (!max_buf) { if (max_buf < sizeof(struct smb2_lock_element)) {
free_xid(xid); free_xid(xid);
return -EINVAL; return -EINVAL;
} }
......
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