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Add function to free compression methods.

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Although the memory allocated by compression methods is fixed and
cannot grow over time it can cause warnings in some leak checking
tools. The function SSL_COMP_free_compression_methods() will free
and zero the list of supported compression methods. This should
*only* be called in a single threaded context when an application
is shutting down to avoid interfering with existing contexts
attempting to look up compression methods.
This commit is contained in:
Dr. Stephen Henson 2014-02-28 18:37:08 +00:00
parent b60272b01f
commit 976c58302b
2 changed files with 13 additions and 0 deletions
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1
ssl/ssl.h
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@ -2510,6 +2510,7 @@ const COMP_METHOD *SSL_get_current_expansion(SSL *s);
const char *SSL_COMP_get_name(const COMP_METHOD *comp); const char *SSL_COMP_get_name(const COMP_METHOD *comp);
STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void); STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void);
STACK_OF(SSL_COMP) *SSL_COMP_set0_compression_methods(STACK_OF(SSL_COMP) *meths); STACK_OF(SSL_COMP) *SSL_COMP_set0_compression_methods(STACK_OF(SSL_COMP) *meths);
void SSL_COMP_free_compression_methods(void);
int SSL_COMP_add_compression_method(int id,COMP_METHOD *cm); int SSL_COMP_add_compression_method(int id,COMP_METHOD *cm);
#else #else
const void *SSL_get_current_compression(SSL *s); const void *SSL_get_current_compression(SSL *s);

12
ssl/ssl_ciph.c
View File

@ -1877,6 +1877,18 @@ STACK_OF(SSL_COMP) *SSL_COMP_set0_compression_methods(STACK_OF(SSL_COMP) *meths)
return old_meths; return old_meths;
} }
static void cmeth_free(SSL_COMP *cm)
{
OPENSSL_free(cm);
}
void SSL_COMP_free_compression_methods(void)
{
STACK_OF(SSL_COMP) *old_meths = ssl_comp_methods;
ssl_comp_methods = NULL;
sk_SSL_COMP_pop_free(old_meths, cmeth_free);
}
int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm) int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
{ {
SSL_COMP *comp; SSL_COMP *comp;