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43 lines
1.7 KiB
43 lines
1.7 KiB
From 9b9531d90dfd8a334958d23394afafd0185bfa21 Mon Sep 17 00:00:00 2001
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From: Willy Tarreau <w@1wt.eu>
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Date: Sat, 28 Mar 2015 12:20:33 +0100
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Subject: [PATCH 8/9] BUG/MINOR: compression: consider the expansion factor in
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init
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When checking if the buffer is large enough, we used to rely on a fixed
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size that was "apparently" enough. We need to consider the expansion
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factor of deflate-encoded streams instead, which is of 5 bytes per 32kB.
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The previous value was OK till 128kB buffers but became wrong past that.
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It's totally harmless since we always keep the reserve when compressiong,
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so there's 1kB or so available, which is enough for buffers as large as
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6.5 MB, but better fix the check anyway.
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This fix could be backported into 1.5 since compression was added there.
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(cherry picked from commit 2aee2215c908c6997addcd1714b5b10f73c0703d)
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---
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src/compression.c | 9 ++++++---
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1 file changed, 6 insertions(+), 3 deletions(-)
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diff --git a/src/compression.c b/src/compression.c
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index 3d6085e..d55f14e 100644
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--- a/src/compression.c
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+++ b/src/compression.c
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@@ -130,9 +130,12 @@ int http_compression_buffer_init(struct session *s, struct buffer *in, struct bu
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{
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int left;
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- /* not enough space */
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- if (in->size - buffer_len(in) < 40)
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- return -1;
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+ /* output stream requires at least 10 bytes for the gzip header, plus
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+ * at least 8 bytes for the gzip trailer (crc+len), plus a possible
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+ * plus at most 5 bytes per 32kB block and 2 bytes to close the stream.
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+ */
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+ if (in->size - buffer_len(in) < 20 + 5 * ((in->i + 32767) >> 15))
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+ return -1;
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/* We start by copying the current buffer's pending outgoing data into
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* a new temporary buffer that we initialize with a new empty chunk.
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--
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2.0.5
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