* [PATCH] arm64: fix the illegal address access in some cases
@ 2020-07-25 1:04 guodeqing
0 siblings, 0 replies; only message in thread
From: guodeqing @ 2020-07-25 1:04 UTC (permalink / raw)
To: catalin.marinas
Cc: robin.murphy, luke.starrett, will, linux-arm-kernel, geffrey.guo
The ihl value of ip header is smaller than 5 in some cases, if the
ihl value is smaller than 5, then the next code will access the illegal
address, and the system will panic.
Here I add the check of the ihl value to solve this problem.
Fixes: 0e455d8e80aa (arm64: Implement optimised IP checksum helpers)
Signed-off-by: guodeqing <geffrey.guo@huawei.com>
---
arch/arm64/include/asm/checksum.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/arm64/include/asm/checksum.h b/arch/arm64/include/asm/checksum.h
index b6f7bc6da5fb..5a7d9acfb6ea 100644
--- a/arch/arm64/include/asm/checksum.h
+++ b/arch/arm64/include/asm/checksum.h
@@ -25,6 +25,9 @@ static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
__uint128_t tmp;
u64 sum;
+ if (unlikely(ihl < 5))
+ return 1;
+
tmp = *(const __uint128_t *)iph;
iph += 16;
ihl -= 4;
--
2.17.1
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