From: Steve French stfrench@microsoft.com
commit 9ed38fd4a15417cac83967360cf20b853bfab9b6 upstream.
Although very unlikely that the tlink pointer would be null in this case, get_next_mid function can in theory return null (but not an error) so need to check for null (not for IS_ERR, which can not be returned here).
Address warning:
fs/smbfs_client/connect.c:2392 cifs_match_super() warn: 'tlink' isn't an ERR_PTR
Pointed out by Dan Carpenter via smatch code analysis tool
CC: stable@vger.kernel.org Reported-by: Dan Carpenter dan.carpenter@oracle.com Acked-by: Ronnie Sahlberg lsahlber@redhat.com Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/cifs/connect.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -3504,9 +3504,10 @@ cifs_match_super(struct super_block *sb, spin_lock(&cifs_tcp_ses_lock); cifs_sb = CIFS_SB(sb); tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb)); - if (IS_ERR(tlink)) { + if (tlink == NULL) { + /* can not match superblock if tlink were ever null */ spin_unlock(&cifs_tcp_ses_lock); - return rc; + return 0; } tcon = tlink_tcon(tlink); ses = tcon->ses;