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httpd: fixed double-free for default 404 file () for LWIP_HTTPD_DYNAMIC_HEADERS==1

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goldsimon 2017-11-13 21:04:24 +01:00
parent 1147b9ce38
commit 365e031340
1 changed files with 10 additions and 3 deletions
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13
src/apps/httpd/httpd.c
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@ -138,6 +138,7 @@
#endif #endif
/* Return values for http_send_*() */ /* Return values for http_send_*() */
#define HTTP_DATA_TO_SEND_FREED 3
#define HTTP_DATA_TO_SEND_BREAK 2 #define HTTP_DATA_TO_SEND_BREAK 2
#define HTTP_DATA_TO_SEND_CONTINUE 1 #define HTTP_DATA_TO_SEND_CONTINUE 1
#define HTTP_NO_DATA_TO_SEND 0 #define HTTP_NO_DATA_TO_SEND 0
@ -972,6 +973,7 @@ get_http_headers(struct http_state *hs, const char *uri)
* - HTTP_DATA_TO_SEND_CONTINUE: continue with sending HTTP body * - HTTP_DATA_TO_SEND_CONTINUE: continue with sending HTTP body
* - HTTP_DATA_TO_SEND_BREAK: data has been enqueued, headers pending, * - HTTP_DATA_TO_SEND_BREAK: data has been enqueued, headers pending,
* so don't send HTTP body yet * so don't send HTTP body yet
* - HTTP_DATA_TO_SEND_FREED: htt_state and pcb are already freed
*/ */
static u8_t static u8_t
http_send_headers(struct altcp_pcb *pcb, struct http_state *hs) http_send_headers(struct altcp_pcb *pcb, struct http_state *hs)
@ -1038,7 +1040,11 @@ http_send_headers(struct altcp_pcb *pcb, struct http_state *hs)
* instead of waiting for ACK from remote side to continue * instead of waiting for ACK from remote side to continue
* (which would happen when sending files from async read). */ * (which would happen when sending files from async read). */
if (http_check_eof(pcb, hs)) { if (http_check_eof(pcb, hs)) {
data_to_send = HTTP_DATA_TO_SEND_CONTINUE; data_to_send = HTTP_DATA_TO_SEND_BREAK;
} else {
/* At this point, for non-keepalive connections, hs is deallocated an
pcb is closed. */
return HTTP_DATA_TO_SEND_FREED;
} }
} }
/* If we get here and there are still header bytes to send, we send /* If we get here and there are still header bytes to send, we send
@ -1552,8 +1558,9 @@ http_send(struct altcp_pcb *pcb, struct http_state *hs)
/* Do we have any more header data to send for this file? */ /* Do we have any more header data to send for this file? */
if (hs->hdr_index < NUM_FILE_HDR_STRINGS) { if (hs->hdr_index < NUM_FILE_HDR_STRINGS) {
data_to_send = http_send_headers(pcb, hs); data_to_send = http_send_headers(pcb, hs);
if ((data_to_send != HTTP_DATA_TO_SEND_CONTINUE) && if ((data_to_send == HTTP_DATA_TO_SEND_FREED) ||
(hs->hdr_index < NUM_FILE_HDR_STRINGS)) { ((data_to_send != HTTP_DATA_TO_SEND_CONTINUE) &&
(hs->hdr_index < NUM_FILE_HDR_STRINGS))) {
return data_to_send; return data_to_send;
} }
} }