43 lines
1.1 KiB
Diff
43 lines
1.1 KiB
Diff
From 821083ac7b54eaa040d5a8ddc67c6206a175e0ca Mon Sep 17 00:00:00 2001
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From: Ariadne Conill <ariadne@dereferenced.org>
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Date: Sat, 1 Aug 2020 08:26:35 -0600
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Subject: [PATCH] implement reallocarray
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reallocarray is an extension introduced by OpenBSD, which introduces
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calloc overflow checking to realloc.
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glibc 2.28 introduced support for this function behind _GNU_SOURCE,
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while glibc 2.29 allows its usage in _DEFAULT_SOURCE.
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diff --git a/include/stdlib.h b/include/stdlib.h
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index 194c2033..b54a051f 100644
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--- a/include/stdlib.h
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+++ b/include/stdlib.h
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@@ -145,6 +145,7 @@ int getloadavg(double *, int);
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int clearenv(void);
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#define WCOREDUMP(s) ((s) & 0x80)
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#define WIFCONTINUED(s) ((s) == 0xffff)
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+void *reallocarray (void *, size_t, size_t);
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#endif
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#ifdef _GNU_SOURCE
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diff --git a/src/malloc/reallocarray.c b/src/malloc/reallocarray.c
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new file mode 100644
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index 00000000..4a6ebe46
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--- /dev/null
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+++ b/src/malloc/reallocarray.c
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@@ -0,0 +1,13 @@
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+#define _BSD_SOURCE
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+#include <errno.h>
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+#include <stdlib.h>
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+
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+void *reallocarray(void *ptr, size_t m, size_t n)
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+{
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+ if (n && m > -1 / n) {
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+ errno = ENOMEM;
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+ return 0;
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+ }
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+
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+ return realloc(ptr, m * n);
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+}
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