kasan: Fix a type conversion error
The current KASAN code can not find the following out-of-bounds bugs: char *ptr; ptr = kmalloc(8, GFP_KERNEL); memset(ptr+7, 0, 2); the cause of the problem is the type conversion error in *memory_is_poisoned_n* function. So this patch fix that. Signed-off-by: Wang Long <long.wanglong@huawei.com> Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Vladimir Murzin <vladimir.murzin@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -203,7 +203,7 @@ static __always_inline bool memory_is_poisoned_n(unsigned long addr,
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s8 *last_shadow = (s8 *)kasan_mem_to_shadow((void *)last_byte);
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if (unlikely(ret != (unsigned long)last_shadow ||
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((last_byte & KASAN_SHADOW_MASK) >= *last_shadow)))
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((long)(last_byte & KASAN_SHADOW_MASK) >= *last_shadow)))
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return true;
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}
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return false;
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