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Add underflow check to UNPOISON counter decrement

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Make sure that extra UNPOISON calls do not cause the poisoning counter
to underflow and wrap around.

Memory that is unpoisoned multiple times should remain unpoisoned.

Signed-off-by: David Horstmann <[email protected]>
This commit is contained in:
David Horstmann
2024-01-17 15:27:50 +00:00
parent 9de6edd462
commit d3efb92922
1 changed files with 3 additions and 1 deletions
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tests/include/test/memory.h
+3 -1
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@@ -94,7 +94,9 @@ void mbedtls_test_memory_unpoison(const unsigned char *ptr, size_t size);
#define MBEDTLS_TEST_MEMORY_UNPOISON(ptr, size) \
do { \
mbedtls_test_memory_unpoison(ptr, size); \
mbedtls_test_memory_poisoning_count--; \
if (mbedtls_test_memory_poisoning_count != 0) { \
mbedtls_test_memory_poisoning_count--; \
} \
} while (0)
#else /* MBEDTLS_TEST_MEMORY_CAN_POISON */