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kasan:fix bug for kasan_mem_to_shadow 

Signed-off-by: anjiahao <anjiahao@xiaomi.com>
This commit is contained in:
anjiahao 2024-01-16 13:30:22 +08:00 committed by Xiang Xiao
parent 780abec239
commit 745611f800
1 changed files with 4 additions and 4 deletions
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8
mm/kasan/kasan.c
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@ -149,7 +149,7 @@ static FAR uintptr_t *kasan_mem_to_shadow(FAR const void *ptr, size_t size,
size_t mod; size_t mod;
size_t i; size_t i;
if (g_region_init != KASAN_INIT_VALUE) if (g_region_init != KASAN_INIT_VALUE || size == 0)
{ {
return NULL; return NULL;
} }
@ -161,7 +161,7 @@ static FAR uintptr_t *kasan_mem_to_shadow(FAR const void *ptr, size_t size,
{ {
ret = kasan_find_mem(addr + i * KASAN_SHADOW_SCALE, ret = kasan_find_mem(addr + i * KASAN_SHADOW_SCALE,
KASAN_SHADOW_SCALE, bit); KASAN_SHADOW_SCALE, bit);
if (ret) if (ret == NULL)
{ {
return ret; return ret;
} }
@ -251,7 +251,7 @@ static bool kasan_is_poisoned(FAR const void *addr, size_t size)
FAR uintptr_t *p; FAR uintptr_t *p;
unsigned int bit; unsigned int bit;
p = kasan_mem_to_shadow(addr + size - 1, 1, &bit); p = kasan_mem_to_shadow(addr, size, &bit);
return p && ((*p >> bit) & 1); return p && ((*p >> bit) & 1);
} }
@ -271,7 +271,7 @@ static void kasan_set_poison(FAR const void *addr, size_t size,
flags = spin_lock_irqsave(&g_lock); flags = spin_lock_irqsave(&g_lock);
p = kasan_mem_to_shadow(addr, size, &bit); p = kasan_find_mem((uintptr_t)addr, size, &bit);
DEBUGASSERT(p != NULL); DEBUGASSERT(p != NULL);
nbit = KASAN_BITS_PER_WORD - bit % KASAN_BITS_PER_WORD; nbit = KASAN_BITS_PER_WORD - bit % KASAN_BITS_PER_WORD;