[openssl-commits] [openssl] OpenSSL_1_0_2-stable update

[Matt Caswell]

The branch OpenSSL_1_0_2-stable has been updated
       via  98f2e513ce5c9425ec5d6316de30fdf4b5d333ee (commit)
      from  b10794b5309a42bd3ea30d824ce1068e5189e66f (commit)


- Log -----------------------------------------------------------------
commit 98f2e513ce5c9425ec5d6316de30fdf4b5d333ee
Author: Billy Brumley <bbrum...@gmail.com>
Date:   Thu Apr 26 19:08:59 2018 +0300

    fix: BN_swap mishandles flags (1.0.2)
    
    Reviewed-by: Rich Salz <rs...@openssl.org>
    Reviewed-by: Matt Caswell <m...@openssl.org>
    (Merged from https://github.com/openssl/openssl/pull/6102)

-----------------------------------------------------------------------

Summary of changes:
 crypto/bn/bn_lib.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/crypto/bn/bn_lib.c b/crypto/bn/bn_lib.c
index 27b9bdb..f49c61c 100644
--- a/crypto/bn/bn_lib.c
+++ b/crypto/bn/bn_lib.c
@@ -503,6 +503,10 @@ BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)
     return (a);
 }
 
+#define FLAGS_DATA(flags) ((flags) & (BN_FLG_STATIC_DATA \
+                                    | BN_FLG_CONSTTIME))
+#define FLAGS_STRUCT(flags) ((flags) & (BN_FLG_MALLOCED))
+
 void BN_swap(BIGNUM *a, BIGNUM *b)
 {
     int flags_old_a, flags_old_b;
@@ -530,10 +534,8 @@ void BN_swap(BIGNUM *a, BIGNUM *b)
     b->dmax = tmp_dmax;
     b->neg = tmp_neg;
 
-    a->flags =
-        (flags_old_a & BN_FLG_MALLOCED) | (flags_old_b & BN_FLG_STATIC_DATA);
-    b->flags =
-        (flags_old_b & BN_FLG_MALLOCED) | (flags_old_a & BN_FLG_STATIC_DATA);
+    a->flags = FLAGS_STRUCT(flags_old_a) | FLAGS_DATA(flags_old_b);
+    b->flags = FLAGS_STRUCT(flags_old_b) | FLAGS_DATA(flags_old_a);
     bn_check_top(a);
     bn_check_top(b);
 }
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