df06c57a4a
[ Upstream commit 05fb3dbda187bbd9cc1cd0e97e5d6595af570ac6 ]
Although iph is expected to point to at least 20 bytes of valid memory,
ihl may be bogus, for example on reception of a corrupt packet. If it
happens to be less than 5, we really don't want to run away and
dereference 16GB worth of memory until it wraps back to exactly zero...
Fixes: 0e455d8e80aa ("arm64: Implement optimised IP checksum helpers")
Reported-by: guodeqing <geffrey.guo@huawei.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/*
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* Copyright (C) 2016 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_CHECKSUM_H
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#define __ASM_CHECKSUM_H
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#include <linux/types.h>
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static inline __sum16 csum_fold(__wsum csum)
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{
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u32 sum = (__force u32)csum;
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sum += (sum >> 16) | (sum << 16);
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return ~(__force __sum16)(sum >> 16);
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}
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#define csum_fold csum_fold
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static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
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{
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__uint128_t tmp;
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u64 sum;
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int n = ihl; /* we want it signed */
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tmp = *(const __uint128_t *)iph;
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iph += 16;
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n -= 4;
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tmp += ((tmp >> 64) | (tmp << 64));
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sum = tmp >> 64;
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do {
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sum += *(const u32 *)iph;
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iph += 4;
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} while (--n > 0);
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sum += ((sum >> 32) | (sum << 32));
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return csum_fold(sum >> 32);
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}
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#define ip_fast_csum ip_fast_csum
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#include <asm-generic/checksum.h>
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#endif /* __ASM_CHECKSUM_H */
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