Commit 1d05eb55 authored by Tomas Mraz's avatar Tomas Mraz

Avoid potential overflow to the sign bit when shifting left 24 places

Although there are platforms where int is 64 bit, 2GiB large BIGNUMs
instead of 4GiB should be "big enough for everybody".
Reviewed-by: default avatarRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11857)
parent cbeb0bfa
......@@ -45,7 +45,7 @@ BIGNUM *BN_mpi2bn(const unsigned char *d, int n, BIGNUM *ain)
int neg = 0;
BIGNUM *a = NULL;
if (n < 4) {
if (n < 4 || (d[0] & 0x80) != 0) {
BNerr(BN_F_BN_MPI2BN, BN_R_INVALID_LENGTH);
return NULL;
}
......
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