531b014e7a
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>
21 lines
434 B
C
21 lines
434 B
C
// SPDX-License-Identifier: GPL-2.0+
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/* Copyright (C) 2018 Netronome Systems, Inc. */
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#ifndef __TOOLS_LIBC_COMPAT_H
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#define __TOOLS_LIBC_COMPAT_H
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#include <stdlib.h>
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#include <linux/overflow.h>
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#ifdef COMPAT_NEED_REALLOCARRAY
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static inline void *reallocarray(void *ptr, size_t nmemb, size_t size)
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{
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size_t bytes;
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if (unlikely(check_mul_overflow(nmemb, size, &bytes)))
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return NULL;
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return realloc(ptr, bytes);
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}
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#endif
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#endif
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