File openssl-CVE-2016-2182-2.patch of Package openssl

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File openssl-CVE-2016-2182-2.patch of Package openssl (Revision 347ef7a180800c818c7ca7eb510217a7)

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commit e36f27ddb80a48e579783bc29fb3758988342b71
Author: Dr. Stephen Henson <steve@openssl.org>
Date:   Fri Aug 5 14:26:03 2016 +0100

Check for errors in BN_bn2dec()
    
    If an oversize BIGNUM is presented to BN_bn2dec() it can cause
    BN_div_word() to fail and not reduce the value of 't' resulting
    in OOB writes to the bn_data buffer and eventually crashing.
    
    Fix by checking return value of BN_div_word() and checking writes
    don't overflow buffer.
    
    Thanks to Shi Lei for reporting this bug.
    
    CVE-2016-2182
    
    Reviewed-by: Tim Hudson <tjh@openssl.org>
    (cherry picked from commit 07bed46f332fce8c1d157689a2cdf915a982ae34)
    
    Conflicts:
    	crypto/bn/bn_print.c

diff --git a/crypto/bn/bn_print.c b/crypto/bn/bn_print.c
index bfa31ef..b44403e 100644
--- a/crypto/bn/bn_print.c
+++ b/crypto/bn/bn_print.c
@@ -111,6 +111,7 @@ char *BN_bn2dec(const BIGNUM *a)
     char *p;
     BIGNUM *t = NULL;
     BN_ULONG *bn_data = NULL, *lp;
+    int bn_data_num;
 
     /*-
      * get an upper bound for the length of the decimal integer
@@ -120,9 +121,9 @@ char *BN_bn2dec(const BIGNUM *a)
      */
     i = BN_num_bits(a) * 3;
     num = (i / 10 + i / 1000 + 1) + 1;
-    bn_data =
-        (BN_ULONG *)OPENSSL_malloc((num / BN_DEC_NUM + 1) * sizeof(BN_ULONG));
-    buf = (char *)OPENSSL_malloc(num + 3);
+    bn_data_num = num / BN_DEC_NUM + 1;
+    bn_data = OPENSSL_malloc(bn_data_num * sizeof(BN_ULONG));
+    buf = OPENSSL_malloc(num + 3);
     if ((buf == NULL) || (bn_data == NULL)) {
         BNerr(BN_F_BN_BN2DEC, ERR_R_MALLOC_FAILURE);
         goto err;
@@ -143,7 +144,11 @@ char *BN_bn2dec(const BIGNUM *a)
         i = 0;
         while (!BN_is_zero(t)) {
             *lp = BN_div_word(t, BN_DEC_CONV);
+            if (*lp == (BN_ULONG)-1)
+                goto err;
             lp++;
+            if (lp - bn_data >= bn_data_num)
+                goto err;
         }
         lp--;
         /*

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File openssl-CVE-2016-2182-2.patch of Package openssl (Revision 347ef7a180800c818c7ca7eb510217a7)

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