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libproxychains.c: fix NULL pointer dereference after fopen().

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if a configuration file can be accessed by proxychains but there is a
mandatory access control (or other) block on the target appication's
ability to read that file, fopen() creates a NULL pointer that will
cause a segfault in fgets().

closes #17

Signed-off-by: mancha <mancha1@hush.com>
This commit is contained in:
mancha 2013-04-30 04:06:36 -04:00
parent 8a93f45007
commit 2aba83087e
1 changed files with 5 additions and 1 deletions
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6
src/libproxychains.c
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@ -168,7 +168,11 @@ static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_typ
*ct = DYNAMIC_TYPE; *ct = DYNAMIC_TYPE;
env = get_config_path(getenv(PROXYCHAINS_CONF_FILE_ENV_VAR), buff, sizeof(buff)); env = get_config_path(getenv(PROXYCHAINS_CONF_FILE_ENV_VAR), buff, sizeof(buff));
file = fopen(env, "r"); if( ( file = fopen(env, "r") ) == NULL )
{
perror("couldnt read configuration file");
exit(1);
}
env = getenv(PROXYCHAINS_QUIET_MODE_ENV_VAR); env = getenv(PROXYCHAINS_QUIET_MODE_ENV_VAR);
if(env && *env == '1') if(env && *env == '1')