Merge topic 'fix_oom_crash'
* changes: strings.c: Fix __ast_str_helper() to always return a terminated string. Add missing failure checks to ast_str_set_va() callers.
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commit
d73bd56b0a
3 changed files with 79 additions and 44 deletions
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@ -2819,6 +2819,7 @@ AST_THREADSTORAGE(userevent_buf);
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*/
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void astman_append(struct mansession *s, const char *fmt, ...)
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{
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int res;
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va_list ap;
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struct ast_str *buf;
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@ -2827,8 +2828,11 @@ void astman_append(struct mansession *s, const char *fmt, ...)
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}
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va_start(ap, fmt);
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ast_str_set_va(&buf, 0, fmt, ap);
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res = ast_str_set_va(&buf, 0, fmt, ap);
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va_end(ap);
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if (res == AST_DYNSTR_BUILD_FAILED) {
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return;
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}
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if (s->f != NULL || s->session->f != NULL) {
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send_string(s, ast_str_buffer(buf));
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@ -2888,6 +2892,7 @@ void astman_send_error(struct mansession *s, const struct message *m, char *erro
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void astman_send_error_va(struct mansession *s, const struct message *m, const char *fmt, ...)
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{
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int res;
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va_list ap;
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struct ast_str *buf;
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char *msg;
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@ -2897,8 +2902,11 @@ void astman_send_error_va(struct mansession *s, const struct message *m, const c
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}
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va_start(ap, fmt);
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ast_str_set_va(&buf, 0, fmt, ap);
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res = ast_str_set_va(&buf, 0, fmt, ap);
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va_end(ap);
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if (res == AST_DYNSTR_BUILD_FAILED) {
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return;
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}
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/* astman_append will use the same underlying buffer, so copy the message out
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* before sending the response */
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@ -60,33 +60,56 @@ int __ast_str_helper(struct ast_str **buf, ssize_t max_len,
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int append, const char *fmt, va_list ap)
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#endif
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{
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int res, need;
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int res;
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int added;
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int need;
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int offset = (append && (*buf)->__AST_STR_LEN) ? (*buf)->__AST_STR_USED : 0;
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va_list aq;
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do {
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if (max_len < 0) {
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max_len = (*buf)->__AST_STR_LEN; /* don't exceed the allocated space */
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}
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/*
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* Ask vsnprintf how much space we need. Remember that vsnprintf
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* does not count the final <code>'\\0'</code> so we must add 1.
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*/
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do {
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va_copy(aq, ap);
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res = vsnprintf((*buf)->__AST_STR_STR + offset, (*buf)->__AST_STR_LEN - offset, fmt, aq);
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va_end(aq);
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need = res + offset + 1;
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if (res < 0) {
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/*
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* If there is not enough space and we are below the max length,
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* reallocate the buffer and return a message telling to retry.
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* vsnprintf write to string failed.
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* I don't think this is possible with a memory buffer.
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*/
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if (need > (*buf)->__AST_STR_LEN && (max_len == 0 || (*buf)->__AST_STR_LEN < max_len) ) {
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int len = (int)(*buf)->__AST_STR_LEN;
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if (max_len && max_len < need) { /* truncate as needed */
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need = max_len;
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} else if (max_len == 0) { /* if unbounded, give more room for next time */
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need += 16 + need / 4;
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res = AST_DYNSTR_BUILD_FAILED;
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added = 0;
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break;
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}
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/*
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* vsnprintf returns how much space we used or would need.
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* Remember that vsnprintf does not count the nil terminator
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* so we must add 1.
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*/
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added = res;
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need = offset + added + 1;
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if (need <= (*buf)->__AST_STR_LEN
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|| (max_len && max_len <= (*buf)->__AST_STR_LEN)) {
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/*
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* There was enough room for the string or we are not
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* allowed to try growing the string buffer.
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*/
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break;
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}
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/* Reallocate the buffer and try again. */
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if (max_len == 0) {
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/* unbounded, give more room for next time */
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need += 16 + need / 4;
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} else if (max_len < need) {
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/* truncate as needed */
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need = max_len;
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}
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if (
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#if (defined(MALLOC_DEBUG) && !defined(STANDALONE))
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_ast_str_make_space(buf, need, file, lineno, function)
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@ -94,21 +117,21 @@ int __ast_str_helper(struct ast_str **buf, ssize_t max_len,
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ast_str_make_space(buf, need)
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#endif
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) {
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ast_log_safe(LOG_VERBOSE, "failed to extend from %d to %d\n", len, need);
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va_end(aq);
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return AST_DYNSTR_BUILD_FAILED;
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}
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(*buf)->__AST_STR_STR[offset] = '\0'; /* Truncate the partial write. */
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ast_log_safe(LOG_VERBOSE, "failed to extend from %d to %d\n",
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(int) (*buf)->__AST_STR_LEN, need);
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/* Restart va_copy before calling vsnprintf() again. */
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va_end(aq);
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continue;
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}
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va_end(aq);
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res = AST_DYNSTR_BUILD_FAILED;
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break;
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}
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} while (1);
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/* update space used, keep in mind the truncation */
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(*buf)->__AST_STR_USED = (res + offset > (*buf)->__AST_STR_LEN) ? (*buf)->__AST_STR_LEN - 1: res + offset;
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/* Update space used, keep in mind truncation may be necessary. */
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(*buf)->__AST_STR_USED = ((*buf)->__AST_STR_LEN <= offset + added)
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? (*buf)->__AST_STR_LEN - 1
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: offset + added;
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/* Ensure that the string is terminated. */
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(*buf)->__AST_STR_STR[(*buf)->__AST_STR_USED] = '\0';
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return res;
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}
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@ -2646,14 +2646,18 @@ struct ast_xml_xpath_results *__attribute__((format(printf, 1, 2))) ast_xmldoc_q
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struct documentation_tree *doctree;
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RAII_VAR(struct ast_str *, xpath_str, ast_str_create(128), ast_free);
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va_list ap;
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int res;
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if (!xpath_str) {
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return NULL;
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}
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va_start(ap, fmt);
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ast_str_set_va(&xpath_str, 0, fmt, ap);
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res = ast_str_set_va(&xpath_str, 0, fmt, ap);
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va_end(ap);
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if (res == AST_DYNSTR_BUILD_FAILED) {
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return NULL;
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}
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AST_RWLIST_RDLOCK(&xmldoc_tree);
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AST_LIST_TRAVERSE(&xmldoc_tree, doctree, entry) {
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