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cifs: fix leak in FSCTL_ENUM_SNAPS response handling

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commit 0e5c795592 upstream.

The server may respond with success, and an output buffer less than
sizeof(struct smb_snapshot_array) in length. Do not leak the output
buffer in this case.

Fixes: 834170c859 ("Enable previous version support")
Signed-off-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Disseldorp 2017-05-03 17:39:09 +02:00 committed by Greg Kroah-Hartman
parent 87c0604d86
commit 449a74439d
1 changed files with 1 additions and 0 deletions
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fs/cifs/smb2ops.c
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@ -924,6 +924,7 @@ smb3_enum_snapshots(const unsigned int xid, struct cifs_tcon *tcon,
}
if (snapshot_in.snapshot_array_size < sizeof(struct smb_snapshot_array)) {
rc = -ERANGE;
kfree(retbuf);
return rc;
}