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Avoid leaking memory in thread_hash (and enable memory leak detection

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for it).
This commit is contained in:
Bodo Möller 2000-04-29 23:58:05 +00:00
parent b222eb6443
commit dcba2534fa
3 changed files with 42 additions and 26 deletions
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6
CHANGES
View File

@ -4,6 +4,12 @@
Changes between 0.9.5a and 0.9.6 [xx XXX 2000]
*) Avoid 'thread_hash' memory leak in crypto/err/err.c by freeing
it in ERR_remove_state if appropriate, and change ERR_get_state
accordingly to avoid race conditions (this is necessary because
thread_hash is no longer constant once set).
[Bodo Moeller]
*) Bugfix for linux-elf makefile.one.
[Ulf Möller]

52
crypto/err/err.c
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@ -116,9 +116,8 @@
#include <openssl/crypto.h>
#include "cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/err.h>
#include <openssl/crypto.h>
#include <openssl/bio.h>
#include <openssl/err.h>
static LHASH *error_hash=NULL;
@ -545,6 +544,7 @@ LHASH *ERR_get_string_table(void)
return(error_hash);
}
/* not thread-safe */
LHASH *ERR_get_err_state_table(void)
{
return(thread_hash);
@ -652,6 +652,12 @@ void ERR_remove_state(unsigned long pid)
tmp.pid=pid;
CRYPTO_w_lock(CRYPTO_LOCK_ERR);
p=(ERR_STATE *)lh_delete(thread_hash,&tmp);
if (lh_num_items(thread_hash) == 0)
{
/* make sure we don't leak memory */
lh_free(thread_hash);
thread_hash = NULL;
}
CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
if (p != NULL) ERR_STATE_free(p);
@ -661,33 +667,19 @@ ERR_STATE *ERR_get_state(void)
{
static ERR_STATE fallback;
ERR_STATE *ret=NULL,tmp,*tmpp;
int thread_state_exists;
int i;
unsigned long pid;
pid=(unsigned long)CRYPTO_thread_id();
CRYPTO_r_lock(CRYPTO_LOCK_ERR);
if (thread_hash == NULL)
{
CRYPTO_r_unlock(CRYPTO_LOCK_ERR);
CRYPTO_w_lock(CRYPTO_LOCK_ERR);
if (thread_hash == NULL)
{
MemCheck_off();
thread_hash=lh_new(pid_hash,pid_cmp);
MemCheck_on();
CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
if (thread_hash == NULL) return(&fallback);
}
else
CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
}
else
if (thread_hash != NULL)
{
tmp.pid=pid;
ret=(ERR_STATE *)lh_retrieve(thread_hash,&tmp);
CRYPTO_r_unlock(CRYPTO_LOCK_ERR);
}
CRYPTO_r_unlock(CRYPTO_LOCK_ERR);
/* ret == the error state, if NULL, make a new one */
if (ret == NULL)
@ -702,9 +694,29 @@ ERR_STATE *ERR_get_state(void)
ret->err_data[i]=NULL;
ret->err_data_flags[i]=0;
}
CRYPTO_w_lock(CRYPTO_LOCK_ERR);
tmpp=(ERR_STATE *)lh_insert(thread_hash,ret);
/* no entry yet in thread_hash for current thread -
* thus, it may have changed since we last looked at it */
if (thread_hash == NULL)
thread_hash = lh_new(pid_hash, pid_cmp);
if (thread_hash == NULL)
thread_state_exists = 0; /* allocation error */
else
{
tmpp=(ERR_STATE *)lh_insert(thread_hash,ret);
thread_state_exists = 1;
}
CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
if (!thread_state_exists)
{
ERR_STATE_free(ret); /* could not insert it */
return(&fallback);
}
if (tmpp != NULL) /* old entry - should not happen */
{
ERR_STATE_free(tmpp);

10
crypto/err/err.h
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@ -253,14 +253,12 @@ void ERR_remove_state(unsigned long pid); /* if zero we look it up */
ERR_STATE *ERR_get_state(void);
#ifdef HEADER_LHASH_H
LHASH *ERR_get_string_table(void );
LHASH *ERR_get_err_state_table(void );
#else
char *ERR_get_string_table(void );
char *ERR_get_err_state_table(void );
LHASH *ERR_get_string_table(void);
LHASH *ERR_get_err_state_table(void); /* even less thread-safe than
* ERR_get_string_table :-) */
#endif
int ERR_get_next_error_library(void );
int ERR_get_next_error_library(void);
#ifdef __cplusplus
}