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fix(cache): align node size to avoid unaligned access runtime errors (#9913)

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This commit is contained in:
André Costa
2026-03-29 18:26:58 +02:00
committed by GitHub
parent eb01918469
commit 5b1b13c761
2 changed files with 52 additions and 7 deletions
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tests/src/test_cases/cache/test_cache.c
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+40
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@@ -320,5 +320,45 @@ void test_cache_entry_alloc(void)
lv_cache_entry_delete(entry);
lv_cache_destroy(cache, NULL);
}
void test_cache_entry_alloc_unaligned_node_size(void)
{
const uint32_t unaligned_sizes[] = { 3, 13 };
for(size_t s = 0; s < sizeof(unaligned_sizes) / sizeof(unaligned_sizes[0]); ++s) {
uint32_t node_size = unaligned_sizes[s];
lv_cache_t * cache = create_cache(&lv_cache_class_lru_rb_size, CACHE_SIZE_BYTES);
TEST_ASSERT_NOT_NULL(cache);
lv_cache_entry_t * entry = lv_cache_entry_alloc(node_size, cache);
TEST_ASSERT_NOT_NULL(entry);
TEST_ASSERT_EQUAL_MESSAGE(
0, ((uintptr_t)entry) % sizeof(void *),
"lv_cache_entry_t * must be pointer-aligned regardless of node_size");
void * data = lv_cache_entry_get_data(entry);
TEST_ASSERT_NOT_NULL(data);
TEST_ASSERT_EQUAL_MESSAGE(
0, ((uintptr_t)data) % sizeof(void *),
"lv_cache_entry_get_data() must be pointer-aligned regardless of node_size");
lv_cache_entry_t * roundtripped = lv_cache_entry_get_entry(data, node_size);
TEST_ASSERT_EQUAL_PTR_MESSAGE(
entry, roundtripped,
"lv_cache_entry_get_entry(lv_cache_entry_get_data(e), node_size) "
"must recover the original entry pointer");
TEST_ASSERT_EQUAL_UINT32_MESSAGE(
node_size, lv_cache_entry_get_node_size(entry),
"get_node_size() must return the original unaligned node_size");
TEST_ASSERT_TRUE_MESSAGE(
(uintptr_t)data < (uintptr_t)entry,
"data pointer must lie before the entry header in the allocation block");
lv_cache_entry_delete(entry);
lv_cache_destroy(cache, NULL);
}
}
#endif