cifs: Fix uninitialized memory read for smb311 posix symlink create

commit a152d05ae4a71d802d50cf9177dba34e8bb09f68 upstream.

If smb311 posix is enabled, we send the intended mode for file
creation in the posix create context. Instead of using what's there on
the stack, create the mfsymlink file with 0644.

Fixes: 9244fc87510ee ("smb3: Add posix create context for smb3.11 posix mounts")
Cc: stable@vger.kernel.org
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Tom Talpey <tom@talpey.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index a24bcbbb50337debaf65e0691f1422353561e95f..b4b15d611dedab16a0ab384af20e9b6a72b2b59c 100644 (file)
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -481,6 +481,7 @@ smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
        oparms.disposition = FILE_CREATE;
        oparms.fid = &fid;
        oparms.reconnect = false;
+       oparms.mode = 0644;
 
        rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
                       NULL);