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

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Although there are platforms where int is 64 bit, 2GiB large BIGNUMs
instead of 4GiB should be "big enough for everybody".

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11857)
This commit is contained in:
Tomas Mraz 2020-05-19 10:51:53 +02:00
parent cbeb0bfa96
commit 1d05eb55ca
1 changed files with 1 additions and 1 deletions
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2
crypto/bn/bn_mpi.c
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@ -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;
}