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userauth.c: fix possible dereference of a null pointer

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This commit is contained in:
Marc Hoersken 2015-03-22 13:51:47 +01:00
parent 55d030089b
commit 0930928810
1 changed files with 3 additions and 1 deletions
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4
src/userauth.c
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@ -884,7 +884,9 @@ userauth_hostbased_fromfile(LIBSSH2_SESSION *session,
datavec[2].iov_base = (void *)session->userauth_host_packet;
datavec[2].iov_len = session->userauth_host_packet_len;
if (privkeyobj->signv(session, &sig, &sig_len, 3, datavec, &abstract)) {
if (privkeyobj && privkeyobj->signv &&
privkeyobj->signv(session, &sig, &sig_len, 3,
datavec, &abstract)) {
LIBSSH2_FREE(session, session->userauth_host_method);
session->userauth_host_method = NULL;
LIBSSH2_FREE(session, session->userauth_host_packet);