diff options
Diffstat (limited to 'src/misc.c')
-rw-r--r-- | src/misc.c | 7 |
1 files changed, 5 insertions, 2 deletions
@@ -699,13 +699,16 @@ int ssh_analyze_banner(ssh_session session, int *ssh1, int *ssh2) { const char *banner = session->clientbanner; const char *openssh; - ssh_log(session, SSH_LOG_RARE, "Analyzing banner: %s", banner); - if (strncmp(banner, "SSH-", 4) != 0) { + if (banner == NULL || + strlen(banner) <= 4 || + strncmp(banner, "SSH-", 4) != 0) { ssh_set_error(session, SSH_FATAL, "Protocol mismatch: %s", banner); return -1; } + ssh_log(session, SSH_LOG_RARE, "Analyzing banner: %s", banner); + /* * Typical banners e.g. are: * SSH-1.5-blah |