Commit bbf23f00 authored by Pavel Shilovsky's avatar Pavel Shilovsky Committed by Greg Kroah-Hartman

CIFS: Fix a possible memory corruption in push locks

commit e3d240e9 upstream.

If maxBuf is not 0 but less than a size of SMB2 lock structure
we can end up with a memory corruption.
Signed-off-by: default avatarPavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9f1f5076
...@@ -260,7 +260,7 @@ smb2_push_mandatory_locks(struct cifsFileInfo *cfile) ...@@ -260,7 +260,7 @@ 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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