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lib: fix segfault on freebsd when using vsnprintf() incorrectly

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FreeBSD's libc segfaults when vsnprintf() is called with a null
format string. Add a null check before calling vsnprintf() to
resolve this problem.

Fixes #3537

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>
This commit is contained in:
Renato Westphal 2019-01-02 22:32:13 -02:00
parent 6205e5dc07
commit 3cb4162cfe
2 changed files with 9 additions and 6 deletions
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13
lib/northbound_cli.c
View File

@ -79,8 +79,7 @@ void nb_cli_enqueue_change(struct vty *vty, const char *xpath,
int nb_cli_apply_changes(struct vty *vty, const char *xpath_base_fmt, ...)
{
struct nb_config *candidate_transitory;
char xpath_base[XPATH_MAXLEN];
va_list ap;
char xpath_base[XPATH_MAXLEN] = {};
bool error = false;
int ret;
@ -94,9 +93,13 @@ int nb_cli_apply_changes(struct vty *vty, const char *xpath_base_fmt, ...)
candidate_transitory = nb_config_dup(vty->candidate_config);
/* Parse the base XPath format string. */
va_start(ap, xpath_base_fmt);
vsnprintf(xpath_base, sizeof(xpath_base), xpath_base_fmt, ap);
va_end(ap);
if (xpath_base_fmt) {
va_list ap;
va_start(ap, xpath_base_fmt);
vsnprintf(xpath_base, sizeof(xpath_base), xpath_base_fmt, ap);
va_end(ap);
}
/* Edit candidate configuration. */
for (size_t i = 0; i < vty->num_cfg_changes; i++) {

2
lib/northbound_cli.h
View File

@ -60,7 +60,7 @@ extern void nb_cli_enqueue_change(struct vty *vty, const char *xpath,
*
* xpath_base_fmt
* Prepend the given XPath (absolute or relative) to all enqueued
* configuration changes.
* configuration changes. This is an optional parameter.
*
* Returns:
* CMD_SUCCESS on success, CMD_WARNING_CONFIG_FAILED otherwise.