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Message-Id: <20200722002426.23580-1-ariadne@dereferenced.org> Date: Tue, 21 Jul 2020 18:24:26 -0600 From: Ariadne Conill <ariadne@...eferenced.org> To: musl@...ts.openwall.com Cc: Ariadne Conill <ariadne@...eferenced.org> Subject: [PATCH] implement reallocarray(3) reallocarray(3) is an extension introduced by OpenBSD, which introduces calloc(3) overflow checking to realloc(3). glibc 2.28 introduced support for this function behind _GNU_SOURCE, while glibc 2.29 allows its usage in _DEFAULT_SOURCE, so I made it available by default as well. --- include/stdlib.h | 1 + src/malloc/reallocarray.c | 13 +++++++++++++ 2 files changed, 14 insertions(+) create mode 100644 src/malloc/reallocarray.c diff --git a/include/stdlib.h b/include/stdlib.h index 194c2033..8db8e5cc 100644 --- a/include/stdlib.h +++ b/include/stdlib.h @@ -38,6 +38,7 @@ void srand (unsigned); void *malloc (size_t); void *calloc (size_t, size_t); void *realloc (void *, size_t); +void *reallocarray (void *, size_t, size_t); void free (void *); void *aligned_alloc(size_t, size_t); diff --git a/src/malloc/reallocarray.c b/src/malloc/reallocarray.c new file mode 100644 index 00000000..733cb16a --- /dev/null +++ b/src/malloc/reallocarray.c @@ -0,0 +1,13 @@ +#include <errno.h> +#include <stdint.h> +#include <stdlib.h> + +void *reallocarray(void *ptr, size_t m, size_t n) +{ + if (n && m > (size_t) -1 / n) { + errno = ENOMEM; + return NULL; + } + + return realloc(ptr, m * n); +} -- 2.27.0
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