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BUG/MINOR: channel/htx: Don't alter channel during forward for empty HTX message

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In channel_htx_forward() and channel_htx_forward_forever(), if the HTX message
is empty, the underlying buffer may be really empty too. And we have no warranty
the caller will call htx_to_buf() later. And in practice, it is almost never
done. So the channel's buffer must not be altered. Otherwise, the buffer may be
considered as full (data == size) for an empty HTX message and no outgoing data.

This patch must be backported to 1.9.
This commit is contained in:
Christopher Faulet 2019-05-29 14:52:56 +02:00
parent 65674662b4
commit a4f9dd4a56
1 changed files with 8 additions and 7 deletions
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15
include/proto/channel.h
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@ -383,20 +383,21 @@ static inline void channel_add_input(struct channel *chn, unsigned int len)
static inline unsigned long long channel_htx_forward(struct channel *chn, struct htx *htx, unsigned long long bytes)
{
unsigned long long ret;
unsigned long long ret = 0;
b_set_data(&chn->buf, htx->data);
ret = channel_forward(chn, bytes);
b_set_data(&chn->buf, b_size(&chn->buf));
if (htx->data) {
b_set_data(&chn->buf, htx->data);
ret = channel_forward(chn, bytes);
b_set_data(&chn->buf, b_size(&chn->buf));
}
return ret;
}
static inline void channel_htx_forward_forever(struct channel *chn, struct htx *htx)
{
b_set_data(&chn->buf, htx->data);
channel_forward_forever(chn);
b_set_data(&chn->buf, b_size(&chn->buf));
c_adv(chn, htx->data - co_data(chn));
chn->to_forward = CHN_INFINITE_FORWARD;
}
/*********************************************************************/
/* These functions are used to compute various channel content sizes */