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-rw-r--r--fuzz/fuzz_assert.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fuzz/fuzz_assert.c b/fuzz/fuzz_assert.c
index 603957ec2bac..9f39f3d6ecb7 100644
--- a/fuzz/fuzz_assert.c
+++ b/fuzz/fuzz_assert.c
@@ -141,7 +141,7 @@ pack(uint8_t *ptr, size_t len, const struct param *p)
goto fail;
if ((cbor_len = cbor_serialize_alloc(array, &cbor,
- &cbor_alloc_len)) > len) {
+ &cbor_alloc_len)) == 0 || cbor_len > len) {
cbor_len = 0;
goto fail;
}