53 lines
1.7 KiB
Diff
53 lines
1.7 KiB
Diff
From: Andreas Schwab <schwab@suse.de>
|
|
Date: Thu, 21 Mar 2013 14:50:27 +0000 (+0100)
|
|
Subject: Fix stack overflow in getaddrinfo with many results
|
|
X-Git-Url: http://sourceware.org/git/?p=glibc.git;a=commitdiff_plain;h=1cef1b19089528db11f221e938f60b9b048945d7
|
|
|
|
Fix stack overflow in getaddrinfo with many results
|
|
---
|
|
|
|
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
|
|
index d95c2d1..2309281 100644
|
|
--- a/sysdeps/posix/getaddrinfo.c
|
|
+++ b/sysdeps/posix/getaddrinfo.c
|
|
@@ -2489,11 +2489,27 @@ getaddrinfo (const char *name, const char *service,
|
|
__typeof (once) old_once = once;
|
|
__libc_once (once, gaiconf_init);
|
|
/* Sort results according to RFC 3484. */
|
|
- struct sort_result results[nresults];
|
|
- size_t order[nresults];
|
|
+ struct sort_result *results;
|
|
+ size_t *order;
|
|
struct addrinfo *q;
|
|
struct addrinfo *last = NULL;
|
|
char *canonname = NULL;
|
|
+ bool malloc_results;
|
|
+
|
|
+ malloc_results
|
|
+ = !__libc_use_alloca (nresults * (sizeof (*results) + sizeof (size_t)));
|
|
+ if (malloc_results)
|
|
+ {
|
|
+ results = malloc (nresults * (sizeof (*results) + sizeof (size_t)));
|
|
+ if (results == NULL)
|
|
+ {
|
|
+ __free_in6ai (in6ai);
|
|
+ return EAI_MEMORY;
|
|
+ }
|
|
+ }
|
|
+ else
|
|
+ results = alloca (nresults * (sizeof (*results) + sizeof (size_t)));
|
|
+ order = (size_t *) (results + nresults);
|
|
|
|
/* Now we definitely need the interface information. */
|
|
if (! check_pf_called)
|
|
@@ -2664,6 +2680,9 @@ getaddrinfo (const char *name, const char *service,
|
|
|
|
/* Fill in the canonical name into the new first entry. */
|
|
p->ai_canonname = canonname;
|
|
+
|
|
+ if (malloc_results)
|
|
+ free (results);
|
|
}
|
|
|
|
__free_in6ai (in6ai);
|