crypto/pem/pvkfmt.c:633: error: USE_AFTER_FREE
  call to `EVP_MD_CTX_free()` eventually accesses memory that was invalidated by call to `free()` on line 627 indirectly during the call to `EVP_DigestInit_ex()`.
Showing all 16 steps of the trace


crypto/pem/pvkfmt.c:624:24: invalidation part of the trace starts here
622.                             const unsigned char *pass, int passlen)
623.   {
624.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
                              ^
625.       int rv = 1;
626.       if (mctx == NULL

crypto/pem/pvkfmt.c:624:24: passed as argument to `EVP_MD_CTX_new`
  622.                             const unsigned char *pass, int passlen)
  623.   {
  624.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
                                ^
  625.       int rv = 1;
  626.       if (mctx == NULL

crypto/pem/pvkfmt.c:624:24: return from call to `EVP_MD_CTX_new`
  622.                             const unsigned char *pass, int passlen)
  623.   {
  624.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
                                ^
  625.       int rv = 1;
  626.       if (mctx == NULL

crypto/pem/pvkfmt.c:624:5: assigned
  622.                             const unsigned char *pass, int passlen)
  623.   {
  624.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
             ^
  625.       int rv = 1;
  626.       if (mctx == NULL

crypto/pem/pvkfmt.c:627:13: when calling `EVP_DigestInit_ex` here
  625.       int rv = 1;
  626.       if (mctx == NULL
  627.           || !EVP_DigestInit_ex(mctx, EVP_sha1(), NULL)
                     ^
  628.           || !EVP_DigestUpdate(mctx, salt, saltlen)
  629.           || !EVP_DigestUpdate(mctx, pass, passlen)

crypto/evp/digest.c:169:1: parameter `ctx` of EVP_DigestInit_ex
    167.   }
    168.   
    169. > int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
    170.   {
    171.       EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);

crypto/evp/digest.c:228:13: when calling `CRYPTO_free` here
    226.       if (ctx->digest != type) {
    227.           if (ctx->digest && ctx->digest->ctx_size)
    228.               OPENSSL_free(ctx->md_data);
                       ^
    229.           ctx->digest = type;
    230.           if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {

crypto/mem.c:233:1: parameter `str` of CRYPTO_free
      231.   }
      232.   
      233. > void CRYPTO_free(void *str)
      234.   {
      235.   #ifndef OPENSSL_NO_CRYPTO_MDEBUG

crypto/mem.c:244:5: was invalidated by call to `free()`
      242.       }
      243.   #else
      244.       free(str);
                 ^
      245.   #endif
      246.   }

crypto/pem/pvkfmt.c:624:24: use-after-lifetime part of the trace starts here
622.                             const unsigned char *pass, int passlen)
623.   {
624.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
                              ^
625.       int rv = 1;
626.       if (mctx == NULL

crypto/pem/pvkfmt.c:624:24: passed as argument to `EVP_MD_CTX_new`
  622.                             const unsigned char *pass, int passlen)
  623.   {
  624.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
                                ^
  625.       int rv = 1;
  626.       if (mctx == NULL

crypto/pem/pvkfmt.c:624:24: return from call to `EVP_MD_CTX_new`
  622.                             const unsigned char *pass, int passlen)
  623.   {
  624.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
                                ^
  625.       int rv = 1;
  626.       if (mctx == NULL

crypto/pem/pvkfmt.c:624:5: assigned
  622.                             const unsigned char *pass, int passlen)
  623.   {
  624.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
             ^
  625.       int rv = 1;
  626.       if (mctx == NULL

crypto/pem/pvkfmt.c:633:5: when calling `EVP_MD_CTX_free` here
  631.           rv = 0;
  632.   
  633.       EVP_MD_CTX_free(mctx);
             ^
  634.       return rv;
  635.   }

crypto/mem.c:233:1: parameter `str` of CRYPTO_free
    231.   }
    232.   
    233. > void CRYPTO_free(void *str)
    234.   {
    235.   #ifndef OPENSSL_NO_CRYPTO_MDEBUG

crypto/mem.c:244:5: invalid access occurs here
    242.       }
    243.   #else
    244.       free(str);
               ^
    245.   #endif
    246.   }
