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httpd: track buffered upload bytes in one accumulator

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This commit is contained in:
bloqaudio
2026-09-01 09:59:52 -05:00
parent daf9d8965a
commit f0f142fbe0
1 changed files with 7 additions and 6 deletions
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httpd/httpd.c
+7 -6
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@@ -48,7 +48,8 @@ __xdata uint8_t boundary[72];
#define CONFIG_UPLOAD_BUF (CONFIG_LEN + 384)
__xdata uint8_t config_upload;
__xdata uint8_t config_buf[CONFIG_UPLOAD_BUF];
// part-header bytes buffered so far; accumulates across TCP segments
// bytes buffered in config_buf so far (config body, or a firmware part
// header); accumulates across TCP segments
__xdata uint16_t pre_acc;
__xdata uint8_t * __xdata content_type = 0;
__xdata uint8_t * __xdata session = 0;
@@ -332,7 +333,7 @@ static uint8_t config_take(void)
// the body is complete once the closing boundary has arrived
cfg_last = 0;
while (1) {
if (cfg_last + cfg_bl + 1 >= write_len)
if (cfg_last + cfg_bl + 1 >= pre_acc)
return 0;
if (strstart_x(&config_buf[cfg_last], boundary)
&& strstart(&config_buf[cfg_last + cfg_bl], "--"))
@@ -548,7 +549,7 @@ void handle_post(void)
dbg_string("Configuration upload\n");
verify_crc = 0;
config_upload = 1;
write_len = 0;
pre_acc = 0;
}
// Check for other POST requests, which are not multipart, below
} else {
@@ -604,15 +605,15 @@ void handle_post(void)
}
if (config_upload) {
frag_len = uip_len - (p - uip_appdata);
if (write_len + frag_len >= CONFIG_UPLOAD_BUF) {
if (pre_acc + frag_len >= CONFIG_UPLOAD_BUF) {
print_string("Configuration too large, aborting.\n");
config_upload = 0;
s->tstate = TSTATE_NONE;
send_bad_request();
return;
}
memcpy(config_buf + write_len, p, frag_len);
write_len += frag_len;
memcpy(config_buf + pre_acc, p, frag_len);
pre_acc += frag_len;
uint8_t taken = config_take();
if (!taken) {