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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: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2007-11-03 04:34:04 +00:00 committed by Steve French
parent 7505e0525c
commit 745542e210
1 changed files with 3 additions and 2 deletions
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5
fs/cifs/cifsencrypt.c
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@ -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) {