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--- a/modules/proxy/mod_proxy_ftp.c 2020/02/07 17:01:07 1873744
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+++ b/modules/proxy/mod_proxy_ftp.c 2020/02/07 17:04:45 1873745
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@@ -218,7 +218,7 @@
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* (EBCDIC) machines either.
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*/
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static apr_status_t ftp_string_read(conn_rec *c, apr_bucket_brigade *bb,
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- char *buff, apr_size_t bufflen, int *eos)
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+ char *buff, apr_size_t bufflen, int *eos, apr_size_t *outlen)
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{
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apr_bucket *e;
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apr_status_t rv;
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@@ -230,6 +230,7 @@
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/* start with an empty string */
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buff[0] = 0;
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*eos = 0;
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+ *outlen = 0;
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/* loop through each brigade */
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while (!found) {
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@@ -273,6 +274,7 @@
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if (len > 0) {
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memcpy(pos, response, len);
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pos += len;
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+ *outlen += len;
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}
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}
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apr_bucket_delete(e);
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@@ -385,28 +387,36 @@
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char buff[5];
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char *mb = msgbuf, *me = &msgbuf[msglen];
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apr_status_t rv;
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+ apr_size_t nread;
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+
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int eos;
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- if (APR_SUCCESS != (rv = ftp_string_read(ftp_ctrl, bb, response, sizeof(response), &eos))) {
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+ if (APR_SUCCESS != (rv = ftp_string_read(ftp_ctrl, bb, response, sizeof(response), &eos, &nread))) {
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return -1;
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}
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/*
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL, APLOGNO(03233)
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"<%s", response);
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*/
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+ if (nread < 4) {
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+ ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, APLOGNO(10229) "Malformed FTP response '%s'", response);
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+ *mb = '\0';
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+ return -1;
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+ }
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+
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if (!apr_isdigit(response[0]) || !apr_isdigit(response[1]) ||
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- !apr_isdigit(response[2]) || (response[3] != ' ' && response[3] != '-'))
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+ !apr_isdigit(response[2]) || (response[3] != ' ' && response[3] != '-'))
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status = 0;
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else
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status = 100 * response[0] + 10 * response[1] + response[2] - 111 * '0';
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mb = apr_cpystrn(mb, response + 4, me - mb);
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- if (response[3] == '-') {
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+ if (response[3] == '-') { /* multi-line reply "123-foo\nbar\n123 baz" */
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memcpy(buff, response, 3);
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buff[3] = ' ';
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do {
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- if (APR_SUCCESS != (rv = ftp_string_read(ftp_ctrl, bb, response, sizeof(response), &eos))) {
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+ if (APR_SUCCESS != (rv = ftp_string_read(ftp_ctrl, bb, response, sizeof(response), &eos, &nread))) {
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return -1;
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}
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mb = apr_cpystrn(mb, response + (' ' == response[0] ? 1 : 4), me - mb);
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