| openssl: avoid NULL pointer dereference in EVP_DigestInit_ex() |
| |
| We should avoid accessing the type pointer if it's NULL, |
| this could happen if ctx->digest is not NULL. |
| |
| Upstream-Status: Submitted |
| http://www.mail-archive.com/openssl-dev@openssl.org/msg32860.html |
| |
| Signed-off-by: Xufeng Zhang <xufeng.zhang@windriver.com> |
| --- |
| Index: openssl-1.0.2/crypto/evp/digest.c |
| =================================================================== |
| --- openssl-1.0.2.orig/crypto/evp/digest.c |
| +++ openssl-1.0.2/crypto/evp/digest.c |
| @@ -208,7 +208,7 @@ int EVP_DigestInit_ex(EVP_MD_CTX *ctx, c |
| return 0; |
| } |
| #endif |
| - if (ctx->digest != type) { |
| + if (type && (ctx->digest != type)) { |
| if (ctx->digest && ctx->digest->ctx_size) |
| OPENSSL_free(ctx->md_data); |
| ctx->digest = type; |