res_pjsip_header_funcs: Duplicate new header value, don't copy.

When updating an existing header the 'update' code incorrectly
just copied the new value into the existing buffer. If the
new value exceeded the available buffer size memory outside
of the buffer would be written into, potentially causing
a crash.

This change makes it so that the 'update' now duplicates
the new header value instead of copying it into the existing
buffer.

diff --git a/res/res_pjsip_header_funcs.c b/res/res_pjsip_header_funcs.c
index 00640a0d22a4c6f99d8911bf313da9b681119f69..ad9be741eca8298b580992f29070cda925648130 100644 (file)
--- a/res/res_pjsip_header_funcs.c
+++ b/res/res_pjsip_header_funcs.c
@@ -676,6 +676,7 @@ static int add_header(void *obj)
 static int update_header(void *obj)
 {
        struct header_data *data = obj;
+       pj_pool_t *pool = data->channel->session->inv_session->dlg->pool;
        pjsip_hdr *hdr = NULL;
        RAII_VAR(struct ast_datastore *, datastore,
                         ast_sip_session_get_datastore(data->channel->session, data->header_datastore->type),
@@ -694,7 +695,7 @@ static int update_header(void *obj)
                return -1;
        }
 
-       pj_strcpy2(&((pjsip_generic_string_hdr *) hdr)->hvalue, data->header_value);
+       pj_strdup2(pool, &((pjsip_generic_string_hdr *) hdr)->hvalue, data->header_value);
 
        return 0;
 }