Remove the CRYPTO_mem_leaks adjustment for the BIO

CRYPTO_mem_leaks attempts to adjust the count of bytes leaks to not
include the BIO that is being used to print the results out. However this
does not work properly. In all internal cases we switch off recording
the memory allocation during creation of the BIO so it makes no difference.
In other cases if the BIO allocates any additional memory during
construction then the adjustment will be wrong anyway. It also skips over
the BIO memory during print_leak anyway, so the BIO memory is never
added into the total. In other words this was broken in lots of ways and
has been since it was first added.

The simplest solution is just to make it the documented behaviour that
you must turn off memory logging when creating the BIO, and remove all
the adjustment stuff completely. The adjustment code was only ever in
master and never made it to a release branch so there is no loss of
functionality.

This commit also fixes a compilation failure when using
enable-crypto-mdebug.

Reviewed-by: Rich Salz <rsalz@openssl.org>

1 files changed, 1 insertions, 13 deletions

diff --git a/crypto/mem_dbg.c b/crypto/mem_dbg.c
index e69869d0e9..d4d72f25c6 100644
--- a/crypto/mem_dbg.c
+++ b/crypto/mem_dbg.c
@@ -536,7 +536,6 @@ void CRYPTO_mem_debug_realloc(void *addr1, void *addr2, size_t num,
 typedef struct mem_leak_st {
     BIO *bio;
     int chunks;
-    int seen;
     long bytes;
 } MEM_LEAK;
 
@@ -560,12 +559,6 @@ static void print_leak(const MEM *m, MEM_LEAK *l)
 
 #define BUF_REMAIN (sizeof buf - (size_t)(bufp - buf))
 
-    /* Is one "leak" the BIO we were given? */
-    if (m->addr == (char *)l->bio) {
-        l->seen = 1;
-        return;
-    }
-
     lcl = localtime(&m->time);
     BIO_snprintf(bufp, BUF_REMAIN, "[%02d:%02d:%02d] ",
                  lcl->tm_hour, lcl->tm_min, lcl->tm_sec);
@@ -653,14 +646,9 @@ int CRYPTO_mem_leaks(BIO *b)
     ml.bio = b;
     ml.bytes = 0;
     ml.chunks = 0;
-    ml.seen = 0;
     if (mh != NULL)
         lh_MEM_doall_MEM_LEAK(mh, print_leak, &ml);
-    /* Don't count the BIO that was passed in as a "leak" */
-    if (ml.seen && ml.chunks >= 1 && ml.bytes >= (int)sizeof (*b)) {
-        ml.chunks--;
-        ml.bytes -= (int)sizeof (*b);
-    }
+
     if (ml.chunks != 0) {
         BIO_printf(b, "%ld bytes leaked in %d chunks\n", ml.bytes, ml.chunks);
     } else {