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author | Jakub Kicinski <jakub.kicinski@netronome.com> | 2018-07-10 14:43:05 -0700 |
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committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-07-11 22:13:34 +0200 |
commit | 531b014e7a2fedaeff0b19b2934d830cd4b35dc0 (patch) | |
tree | 0de8355e9d533b4f6f90c3b389f58c992e75bb14 /tools/include/tools | |
parent | tools: libbpf: move library error code into a separate file (diff) | |
download | linux-dev-531b014e7a2fedaeff0b19b2934d830cd4b35dc0.tar.xz linux-dev-531b014e7a2fedaeff0b19b2934d830cd4b35dc0.zip |
tools: bpf: make use of reallocarray
reallocarray() is a safer variant of realloc which checks for
multiplication overflow in case of array allocation. Since it's
not available in Glibc < 2.26 import kernel's overflow.h and
add a static inline implementation when needed. Use feature
detection to probe for existence of reallocarray.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/include/tools')
-rw-r--r-- | tools/include/tools/libc_compat.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/tools/include/tools/libc_compat.h b/tools/include/tools/libc_compat.h new file mode 100644 index 000000000000..664ced8cb1b0 --- /dev/null +++ b/tools/include/tools/libc_compat.h @@ -0,0 +1,20 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* Copyright (C) 2018 Netronome Systems, Inc. */ + +#ifndef __TOOLS_LIBC_COMPAT_H +#define __TOOLS_LIBC_COMPAT_H + +#include <stdlib.h> +#include <linux/overflow.h> + +#ifdef COMPAT_NEED_REALLOCARRAY +static inline void *reallocarray(void *ptr, size_t nmemb, size_t size) +{ + size_t bytes; + + if (unlikely(check_mul_overflow(nmemb, size, &bytes))) + return NULL; + return realloc(ptr, bytes); +} +#endif +#endif |