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-rw-r--r--fuzz/bignum.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/fuzz/bignum.c b/fuzz/bignum.c
index d7c3716aac..783e915977 100644
--- a/fuzz/bignum.c
+++ b/fuzz/bignum.c
@@ -52,11 +52,12 @@ int FuzzerTestOneInput(const uint8_t *buf, size_t len)
*/
if (len > 2) {
len -= 3;
- l1 = (buf[0] * len) / 255;
+ /* limit l1, l2, and l3 to be no more than 512 bytes */
+ l1 = ((buf[0] * len) / 255) % 512;
++buf;
- l2 = (buf[0] * (len - l1)) / 255;
+ l2 = ((buf[0] * (len - l1)) / 255) % 512;
++buf;
- l3 = len - l1 - l2;
+ l3 = (len - l1 - l2) % 512;
s1 = buf[0] & 1;
s3 = buf[0] & 4;