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authorDaniel Stenberg <daniel@haxx.se>2019-09-05 00:08:21 +0200
committerDaniel Stenberg <daniel@haxx.se>2019-09-09 09:36:27 +0200
commitc4c9e070f35c113b8b9c4d79ca1b9c1afe87d0e4 (patch)
tree912b7e417bcbd50547567bdfeface0f2d2c2f8cc /lib
parent74e152f11915cdd46792daf5c5728be1b0dd9503 (diff)
Curl_fillreadbuffer: avoid double-free trailer buf on error
Reviewed-by: Jay Satiro Reported-by: Thomas Vegas Closes #4307
Diffstat (limited to 'lib')
-rw-r--r--lib/http.c16
-rw-r--r--lib/http.h2
-rw-r--r--lib/transfer.c11
3 files changed, 17 insertions, 12 deletions
diff --git a/lib/http.c b/lib/http.c
index d352d139d..28d1fa607 100644
--- a/lib/http.c
+++ b/lib/http.c
@@ -1146,10 +1146,14 @@ Curl_send_buffer *Curl_add_buffer_init(void)
*/
void Curl_add_buffer_free(Curl_send_buffer **inp)
{
- Curl_send_buffer *in = *inp;
- if(in) /* deal with NULL input */
+ Curl_send_buffer *in;
+ if(!inp)
+ return;
+ in = *inp;
+ if(in) { /* deal with NULL input */
free(in->buffer);
- free(in);
+ free(in);
+ }
*inp = NULL;
}
@@ -1720,7 +1724,7 @@ enum proxy_use {
will return an error code if one of the headers is
not formatted correctly */
CURLcode Curl_http_compile_trailers(struct curl_slist *trailers,
- Curl_send_buffer *buffer,
+ Curl_send_buffer **buffer,
struct Curl_easy *handle)
{
char *ptr = NULL;
@@ -1746,7 +1750,7 @@ CURLcode Curl_http_compile_trailers(struct curl_slist *trailers,
/* only add correctly formatted trailers */
ptr = strchr(trailers->data, ':');
if(ptr && *(ptr + 1) == ' ') {
- result = Curl_add_bufferf(&buffer, "%s%s", trailers->data,
+ result = Curl_add_bufferf(buffer, "%s%s", trailers->data,
endofline_native);
if(result)
return result;
@@ -1755,7 +1759,7 @@ CURLcode Curl_http_compile_trailers(struct curl_slist *trailers,
infof(handle, "Malformatted trailing header ! Skipping trailer.");
trailers = trailers->next;
}
- result = Curl_add_buffer(&buffer, endofline_network,
+ result = Curl_add_buffer(buffer, endofline_network,
strlen(endofline_network));
return result;
}
diff --git a/lib/http.h b/lib/http.h
index 5bacb1754..f0ddec759 100644
--- a/lib/http.h
+++ b/lib/http.h
@@ -75,7 +75,7 @@ CURLcode Curl_add_custom_headers(struct connectdata *conn,
bool is_connect,
Curl_send_buffer *req_buffer);
CURLcode Curl_http_compile_trailers(struct curl_slist *trailers,
- Curl_send_buffer *buffer,
+ Curl_send_buffer **buffer,
struct Curl_easy *handle);
/* protocol-specific functions set up to be called by the main engine */
diff --git a/lib/transfer.c b/lib/transfer.c
index 7e57fbe03..ef0d80638 100644
--- a/lib/transfer.c
+++ b/lib/transfer.c
@@ -176,7 +176,7 @@ CURLcode Curl_fillreadbuffer(struct connectdata *conn, size_t bytes,
#ifndef CURL_DISABLE_HTTP
if(data->state.trailers_state == TRAILERS_INITIALIZED) {
struct curl_slist *trailers = NULL;
- CURLcode c;
+ CURLcode result;
int trailers_ret_code;
/* at this point we already verified that the callback exists
@@ -195,17 +195,18 @@ CURLcode Curl_fillreadbuffer(struct connectdata *conn, size_t bytes,
data->set.trailer_data);
Curl_set_in_callback(data, false);
if(trailers_ret_code == CURL_TRAILERFUNC_OK) {
- c = Curl_http_compile_trailers(trailers, data->state.trailers_buf, data);
+ result = Curl_http_compile_trailers(trailers, &data->state.trailers_buf,
+ data);
}
else {
failf(data, "operation aborted by trailing headers callback");
*nreadp = 0;
- c = CURLE_ABORTED_BY_CALLBACK;
+ result = CURLE_ABORTED_BY_CALLBACK;
}
- if(c != CURLE_OK) {
+ if(result) {
Curl_add_buffer_free(&data->state.trailers_buf);
curl_slist_free_all(trailers);
- return c;
+ return result;
}
infof(data, "Successfully compiled trailers.\r\n");
curl_slist_free_all(trailers);