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https://github.com/openresty/openresty
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70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
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# HG changeset patch
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# User Maxim Dounin <mdounin@mdounin.ru>
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# Date 1315324342 -14400
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# Node ID 4cf0af103bc382a78f894302d1706929a79df4bb
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# Parent d603ce98fada855f0100b422b7b5672fd22fabea
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Gzip filter: handle empty flush buffers.
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Empty flush buffers are legitimate and may happen e.g. due to $r->flush()
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calls in embedded perl. If there are no data buffered in zlib deflate()
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will return Z_BUF_ERROR (i.e. no progress possible) without adding anything
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to output. Don't treat Z_BUF_ERROR as fatal and correctly send empty flush
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buffer if we have no data in output at all.
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See this thread for details:
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http://mailman.nginx.org/pipermail/nginx/2010-November/023693.html
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diff --git a/src/http/modules/ngx_http_gzip_filter_module.c b/src/http/modules/ngx_http_gzip_filter_module.c
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--- a/src/http/modules/ngx_http_gzip_filter_module.c
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+++ b/src/http/modules/ngx_http_gzip_filter_module.c
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@@ -758,6 +758,7 @@ static ngx_int_t
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ngx_http_gzip_filter_deflate(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx)
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{
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int rc;
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+ ngx_buf_t *b;
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ngx_chain_t *cl;
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ngx_http_gzip_conf_t *conf;
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@@ -769,7 +770,7 @@ ngx_http_gzip_filter_deflate(ngx_http_re
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rc = deflate(&ctx->zstream, ctx->flush);
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- if (rc != Z_OK && rc != Z_STREAM_END) {
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+ if (rc != Z_OK && rc != Z_STREAM_END && rc != Z_BUF_ERROR) {
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ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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"deflate() failed: %d, %d", ctx->flush, rc);
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return NGX_ERROR;
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@@ -818,8 +819,6 @@ ngx_http_gzip_filter_deflate(ngx_http_re
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if (ctx->flush == Z_SYNC_FLUSH) {
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- ctx->zstream.avail_out = 0;
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- ctx->out_buf->flush = 1;
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ctx->flush = Z_NO_FLUSH;
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cl = ngx_alloc_chain_link(r->pool);
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@@ -827,7 +826,22 @@ ngx_http_gzip_filter_deflate(ngx_http_re
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return NGX_ERROR;
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}
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- cl->buf = ctx->out_buf;
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+ b = ctx->out_buf;
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+
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+ if (ngx_buf_size(b) == 0) {
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+
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+ b = ngx_calloc_buf(ctx->request->pool);
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+ if (b == NULL) {
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+ return NGX_ERROR;
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+ }
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+
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+ } else {
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+ ctx->zstream.avail_out = 0;
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+ }
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+
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+ b->flush = 1;
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+
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+ cl->buf = b;
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cl->next = NULL;
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*ctx->last_out = cl;
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ctx->last_out = &cl->next;
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