The branch OpenSSL_1_1_0-stable has been updated
via 2392eb77d237684a32b1290fc9e3d0e2f3b08554 (commit)
from 4e07941373ac17086ab4e601950c4ca148e8bb31 (commit)
- Log -----------------------------------------------------------------
commit 2392eb77d237684a32b1290fc9e3d0e2f3b08554
Author: Bernd Edlinger <[email protected]>
Date: Thu Mar 29 11:27:29 2018 +0200
Fix a possible crash in BN_from_montgomery_word
Thanks to Darovskikh Andrei for for reporting this issue.
Fixes: #5785
Fixes: #6302
Cherry-picked from f91e026e3832 (without test/bntest.c)
Reviewed-by: Rich Salz <[email protected]>
Reviewed-by: Matthias St. Pierre <[email protected]>
(Merged from https://github.com/openssl/openssl/pull/6310)
-----------------------------------------------------------------------
Summary of changes:
crypto/bn/bn_mont.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/crypto/bn/bn_mont.c b/crypto/bn/bn_mont.c
index c0c1746..dad3d07 100644
--- a/crypto/bn/bn_mont.c
+++ b/crypto/bn/bn_mont.c
@@ -95,6 +95,8 @@ static int BN_from_montgomery_word(BIGNUM *ret, BIGNUM *r,
BN_MONT_CTX *mont)
/* clear the top words of T */
i = max - r->top;
+ if (i < 0)
+ return 0;
if (i)
memset(&rp[r->top], 0, sizeof(*rp) * i);
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