Might want to update the buffer pointer after a realloc (or we crash)

(closes issue #14485)
 Reported by: davevg

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@176360 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/main/strings.c b/main/strings.c
index 56bb562..bdf007f 100644 (file)
--- a/main/strings.c
+++ b/main/strings.c
@@ -131,6 +131,7 @@ char *__ast_str_helper2(struct ast_str **buf, size_t maxlen, const char *src, si
                (*buf)->__AST_STR_USED++;
 
                if (dynamic && (!maxlen || (escapecommas && !(maxlen - 1)))) {
+                       char *oldbase = (*buf)->__AST_STR_STR;
                        size_t old = (*buf)->__AST_STR_LEN;
                        if (ast_str_make_space(buf, (*buf)->__AST_STR_LEN * 2)) {
                                /* If the buffer can't be extended, end it. */
@@ -138,6 +139,11 @@ char *__ast_str_helper2(struct ast_str **buf, size_t maxlen, const char *src, si
                        }
                        /* What we extended the buffer by */
                        maxlen = old;
+
+                       /* Update ptr, if necessary */
+                       if ((*buf)->__AST_STR_STR != oldbase) {
+                               ptr = ptr - oldbase + (*buf)->__AST_STR_STR;
+                       }
                }
        }
        if (__builtin_expect(!(maxsrc && maxlen), 0)) {