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Commit 745542e2 authored by Jeff Layton's avatar Jeff Layton Committed by Steve French
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[CIFS] allow cifs_calc_signature2 to deal with a zero length iovec 



Currently, cifs_calc_signature2 errors out if it gets a zero-length
iovec. Fix it to silently continue in that case.

Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent 7505e052

fs/cifs/cifsencrypt.c

+3 −2
Original line number Diff line number Diff line
@@ -99,11 +99,12 @@ static int cifs_calc_signature2(const struct kvec *iov, int n_vec, 
	MD5Init(&context);

	MD5Update(&context, (char *)&key->data, key->len);

	for (i = 0; i < n_vec; i++) {

		if (iov[i].iov_len == 0)

			continue;

		if (iov[i].iov_base == NULL) {

			cERROR(1, ("null iovec entry"));

			return -EIO;

		} else if (iov[i].iov_len == 0)

			break; /* bail out if we are sent nothing to sign */

		}

		/* The first entry includes a length field (which does not get

		   signed that occupies the first 4 bytes before the header */

		if (i == 0) {