diff options
author | Paul Eggert <eggert@cs.ucla.edu> | 2004-11-17 23:05:47 +0000 |
---|---|---|
committer | Paul Eggert <eggert@cs.ucla.edu> | 2004-11-17 23:05:47 +0000 |
commit | 31d4ee218ba9dabe654a9fbf53a72e5bf203b0dc (patch) | |
tree | bbf403b1ee699dc4099754adb5ebf1ce79bd4e97 /lib/calloc.c | |
parent | 7b2dc3362ca654843fae1d6c14233ae5701a72df (diff) | |
download | gnulib-31d4ee218ba9dabe654a9fbf53a72e5bf203b0dc.tar.gz |
(rpl_calloc): Defend against buggy calloc implementations
that mishandle size_t overflow.
Diffstat (limited to 'lib/calloc.c')
-rw-r--r-- | lib/calloc.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/lib/calloc.c b/lib/calloc.c index 2a9e6fa20e..1ff0f1c0b8 100644 --- a/lib/calloc.c +++ b/lib/calloc.c @@ -1,4 +1,4 @@ -/* Work around the condition whereby calloc (n, s) fails when n*s is 0. +/* calloc() function that is glibc compatible. This wrapper function is required at least on Tru64 UNIX 5.1. Copyright (C) 2004 Free Software Foundation, Inc. @@ -31,9 +31,17 @@ void * rpl_calloc (size_t n, size_t s) { + size_t bytes; if (n == 0) n = 1; if (s == 0) s = 1; + + /* Defend against buggy calloc implementations that mishandle + size_t overflow. */ + bytes = n * s; + if (bytes / s != n) + return NULL; + return calloc (n, s); } |