diff options
| -rw-r--r-- | networking/tftp.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/networking/tftp.c b/networking/tftp.c index 04bfe844f..e74186884 100644 --- a/networking/tftp.c +++ b/networking/tftp.c @@ -402,9 +402,17 @@ static int tftp_protocol( /* Open file (must be after changing user) */ local_fd = open(local_file, open_mode, 0666); if (local_fd < 0) { + /* sanitize name, it came from untrusted remote side */ + unsigned char *p = (void *) local_file; + while (*p) { + if (*p < ' ') + *p = '?'; + p++; + } + bb_perror_msg("can't open '%s'", local_file); G_error_pkt_reason = ERR_NOFILE; strcpy(G_error_pkt_str, "can't open file"); - goto send_err_pkt; + goto send_err_pkt_nomsg; } /* gcc 4.3.1 would NOT optimize it out as it should! */ #if ENABLE_FEATURE_TFTP_BLOCKSIZE @@ -721,7 +729,7 @@ static int tftp_protocol( * must never resend the current DATA packet on receipt * of a duplicate ACK". * DATA pkts are resent ONLY on timeout. - * Thus "goto send_again" will ba a bad mistake above. + * Thus "goto send_again" will be a bad mistake above. * See: * http://en.wikipedia.org/wiki/Sorcerer's_Apprentice_Syndrome */ @@ -740,6 +748,7 @@ static int tftp_protocol( send_err_pkt: if (G_error_pkt_str[0]) bb_simple_error_msg(G_error_pkt_str); + send_err_pkt_nomsg: G.error_pkt[1] = TFTP_ERROR; xsendto(socket_fd, G.error_pkt, 4 + 1 + strlen(G_error_pkt_str), &peer_lsa->u.sa, peer_lsa->len); |