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Fix corner case in preparing cgi env

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`path_info` was dereferenced without checking for NULL, and a few lines
below, it was checked for NULL.

CL: none

PUBLISHED_FROM=9f14dc68c152b9b1119b276f047686d831bace38
This commit is contained in:
Dmitry Frank
2018-01-30 20:39:54 +00:00
committed by Cesanta Bot
parent 8e366916d5
commit ce8657f12f
1 changed files with 2 additions and 1 deletions
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mongoose.c
+2 -1
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@@ -8845,6 +8845,7 @@ static void mg_prepare_cgi_environment(struct mg_connection *nc,
char *p;
size_t i;
char buf[100];
size_t path_info_len = path_info != NULL ? path_info->len : 0;
blk->len = blk->nvars = 0;
blk->nc = nc;
@@ -8876,7 +8877,7 @@ static void mg_prepare_cgi_environment(struct mg_connection *nc,
mg_conn_addr_to_str(nc, buf, sizeof(buf), MG_SOCK_STRINGIFY_PORT);
mg_addenv(blk, "SERVER_PORT=%s", buf);
s = hm->uri.p + hm->uri.len - path_info->len - 1;
s = hm->uri.p + hm->uri.len - path_info_len - 1;
if (*s == '/') {
const char *base_name = strrchr(prog, DIRSEP);
mg_addenv(blk, "SCRIPT_NAME=%.*s/%s", (int) (s - hm->uri.p), hm->uri.p,