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BUG/MEDIUM: htx: fix random premature abort of data transfers

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It can happen in some cases that the last block of an H2 transfer over
HTX is truncated. This was tracked down to a leftover of an earlier
implementation of htx_xfer_blks() causing the computed size of a block
to be incorrectly calculated if a data block doesn't completely fit into
the target buffer. In practice it causes the EOM block to be attempted to
be emitted with a wrong size and the message to be truncated. One way to
reproduce this is to chain two haproxy instances in h1->h2->h1 with
httpterm as the server and h2load as the client, making many requests
between 8 and 10kB over a single connection. Usually one of the very
first requests will fail.

This fix must be backported to 1.9.
This commit is contained in:
Willy Tarreau 2019-04-09 16:21:54 +02:00
parent 3ca18bf0bd
commit 90caa07935
1 changed files with 2 additions and 2 deletions
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4
src/htx.c
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@ -519,8 +519,8 @@ struct htx_ret htx_xfer_blks(struct htx *dst, struct htx *src, uint32_t count,
max = htx_free_data_space(dst);
if (max > count)
max = count;
if (ret + sz > max) {
sz = max - ret;
if (sz > max) {
sz = max;
info = (type << 28) + sz;
/* Headers and pseudo headers must be fully copied */
if (type < HTX_BLK_DATA || !sz)