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cifs: check MaxPathNameComponentLength != 0 before using it 

And fix tcon leak in error path.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: David Disseldorp <ddiss@samba.org>
This commit is contained in:
Ronnie Sahlberg 2017-10-30 13:28:03 +11:00 committed by Steve French
parent 0b07194bb5
commit f74bc7c667
1 changed files with 3 additions and 2 deletions
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5
fs/cifs/dir.c
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@ -204,7 +204,8 @@ check_name(struct dentry *direntry, struct cifs_tcon *tcon)
struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
int i;
if (unlikely(direntry->d_name.len >
if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength &&
direntry->d_name.len >
le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength)))
return -ENAMETOOLONG;
@ -520,7 +521,7 @@ cifs_atomic_open(struct inode *inode, struct dentry *direntry,
rc = check_name(direntry, tcon);
if (rc)
goto out_free_xid;
goto out;
server = tcon->ses->server;