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-rw-r--r--crypto/bn/bn_shift.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/crypto/bn/bn_shift.c b/crypto/bn/bn_shift.c
index 4f3e8ffed7b6..9673d9a30633 100644
--- a/crypto/bn/bn_shift.c
+++ b/crypto/bn/bn_shift.c
@@ -137,6 +137,11 @@ int BN_lshift(BIGNUM *r, const BIGNUM *a, int n)
bn_check_top(r);
bn_check_top(a);
+ if (n < 0) {
+ BNerr(BN_F_BN_LSHIFT, BN_R_INVALID_SHIFT);
+ return 0;
+ }
+
r->neg = a->neg;
nw = n / BN_BITS2;
if (bn_wexpand(r, a->top + nw + 1) == NULL)
@@ -174,6 +179,11 @@ int BN_rshift(BIGNUM *r, const BIGNUM *a, int n)
bn_check_top(r);
bn_check_top(a);
+ if (n < 0) {
+ BNerr(BN_F_BN_RSHIFT, BN_R_INVALID_SHIFT);
+ return 0;
+ }
+
nw = n / BN_BITS2;
rb = n % BN_BITS2;
lb = BN_BITS2 - rb;