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FastCGI: fixed zero size buf alerts on extra data (ticket #2018).

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After 05e42236e95b (1.19.1) responses with extra data might result in
zero size buffers being generated and "zero size buf" alerts in writer
(if f->rest happened to be 0 when processing additional stdout data).
This commit is contained in:
Maxim Dounin 2020-07-27 16:02:15 +03:00
parent c3db6f729f
commit d2744ad26f
1 changed files with 22 additions and 6 deletions
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28
src/http/modules/ngx_http_fastcgi_module.c
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@ -2306,6 +2306,18 @@ ngx_http_fastcgi_input_filter(ngx_event_pipe_t *p, ngx_buf_t *buf)
break;
}
if (f->rest == -2) {
f->rest = r->upstream->headers_in.content_length_n;
}
if (f->rest == 0) {
ngx_log_error(NGX_LOG_WARN, p->log, 0,
"upstream sent more data than specified in "
"\"Content-Length\" header");
p->upstream_done = 1;
break;
}
cl = ngx_chain_get_free_buf(p->pool, &p->free);
if (cl == NULL) {
return NGX_ERROR;
@ -2349,11 +2361,7 @@ ngx_http_fastcgi_input_filter(ngx_event_pipe_t *p, ngx_buf_t *buf)
b->last = f->last;
}
if (f->rest == -2) {
f->rest = r->upstream->headers_in.content_length_n;
}
if (f->rest >= 0) {
if (f->rest > 0) {
if (b->last - b->pos > f->rest) {
ngx_log_error(NGX_LOG_WARN, p->log, 0,
@ -2564,6 +2572,14 @@ ngx_http_fastcgi_non_buffered_filter(void *data, ssize_t bytes)
break;
}
if (f->rest == 0) {
ngx_log_error(NGX_LOG_WARN, r->connection->log, 0,
"upstream sent more data than specified in "
"\"Content-Length\" header");
u->length = 0;
break;
}
cl = ngx_chain_get_free_buf(r->pool, &u->free_bufs);
if (cl == NULL) {
return NGX_ERROR;
@ -2594,7 +2610,7 @@ ngx_http_fastcgi_non_buffered_filter(void *data, ssize_t bytes)
b->last = f->last;
}
if (f->rest >= 0) {
if (f->rest > 0) {
if (b->last - b->pos > f->rest) {
ngx_log_error(NGX_LOG_WARN, r->connection->log, 0,