crypto/pem/pvkfmt.c:662: error: USE_AFTER_FREE
  call to `EVP_MD_CTX_free()` eventually accesses memory that was invalidated by call to `free()` on line 656 indirectly during the call to `EVP_DigestInit_ex()`.
Showing all 16 steps of the trace


crypto/pem/pvkfmt.c:653:24: invalidation part of the trace starts here
651.                             const unsigned char *pass, int passlen)
652.   {
653.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
                              ^
654.       int rv = 1;
655.       if (mctx == NULL

crypto/pem/pvkfmt.c:653:24: passed as argument to `EVP_MD_CTX_new`
  651.                             const unsigned char *pass, int passlen)
  652.   {
  653.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
                                ^
  654.       int rv = 1;
  655.       if (mctx == NULL

crypto/pem/pvkfmt.c:653:24: return from call to `EVP_MD_CTX_new`
  651.                             const unsigned char *pass, int passlen)
  652.   {
  653.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
                                ^
  654.       int rv = 1;
  655.       if (mctx == NULL

crypto/pem/pvkfmt.c:653:5: assigned
  651.                             const unsigned char *pass, int passlen)
  652.   {
  653.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
             ^
  654.       int rv = 1;
  655.       if (mctx == NULL

crypto/pem/pvkfmt.c:656:13: when calling `EVP_DigestInit_ex` here
  654.       int rv = 1;
  655.       if (mctx == NULL
  656.           || !EVP_DigestInit_ex(mctx, EVP_sha1(), NULL)
                     ^
  657.           || !EVP_DigestUpdate(mctx, salt, saltlen)
  658.           || !EVP_DigestUpdate(mctx, pass, passlen)

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

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

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

crypto/mem.c:245:5: was invalidated by call to `free()`
      243.       }
      244.   #else
      245.       free(str);
                 ^
      246.   #endif
      247.   }

crypto/pem/pvkfmt.c:653:24: use-after-lifetime part of the trace starts here
651.                             const unsigned char *pass, int passlen)
652.   {
653.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
                              ^
654.       int rv = 1;
655.       if (mctx == NULL

crypto/pem/pvkfmt.c:653:24: passed as argument to `EVP_MD_CTX_new`
  651.                             const unsigned char *pass, int passlen)
  652.   {
  653.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
                                ^
  654.       int rv = 1;
  655.       if (mctx == NULL

crypto/pem/pvkfmt.c:653:24: return from call to `EVP_MD_CTX_new`
  651.                             const unsigned char *pass, int passlen)
  652.   {
  653.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
                                ^
  654.       int rv = 1;
  655.       if (mctx == NULL

crypto/pem/pvkfmt.c:653:5: assigned
  651.                             const unsigned char *pass, int passlen)
  652.   {
  653.       EVP_MD_CTX *mctx = EVP_MD_CTX_new();
             ^
  654.       int rv = 1;
  655.       if (mctx == NULL

crypto/pem/pvkfmt.c:662:5: when calling `EVP_MD_CTX_free` here
  660.           rv = 0;
  661.   
  662.       EVP_MD_CTX_free(mctx);
             ^
  663.       return rv;
  664.   }

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

crypto/mem.c:245:5: invalid access occurs here
    243.       }
    244.   #else
    245.       free(str);
               ^
    246.   #endif
    247.   }
