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BUG/MINOR: filters: Always set FLT_END analyser when CF_FLT_ANALYZE flag is set 

CF_FLT_ANALYZE flags may be set before the FLT_END analyser. Thus if an error is
triggered in the mean time, this may block the stream and prevent it to be
released. It is indeed a problem only for the response channel because the
response analysers may be skipped on early errors.

So, to prevent any issue, depending on the code path, the FLT_END analyser is
systematically set when the CF_FLT_ANALYZE flag is set.

This patch must be backported in all stable branches.
This commit is contained in:
Christopher Faulet 2021-08-13 14:00:46 +02:00
parent 2c04a5a03d
commit 26eb5ea352
1 changed files with 10 additions and 3 deletions
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13
src/filters.c
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@ -473,8 +473,10 @@ flt_stream_start(struct stream *s)
if (FLT_OPS(filter)->stream_start && FLT_OPS(filter)->stream_start(s, filter) < 0)
return -1;
}
if (strm_li(s) && (strm_li(s)->analysers & AN_REQ_FLT_START_FE))
if (strm_li(s) && (strm_li(s)->analysers & AN_REQ_FLT_START_FE)) {
s->req.flags |= CF_FLT_ANALYZE;
s->req.analysers |= AN_RES_FLT_END;
}
return 0;
}
@ -533,10 +535,14 @@ flt_set_stream_backend(struct stream *s, struct proxy *be)
FLT_OPS(filter)->stream_set_backend(s, filter, be) < 0)
return -1;
}
if (be->be_req_ana & AN_REQ_FLT_START_BE)
if (be->be_req_ana & AN_REQ_FLT_START_BE) {
s->req.flags |= CF_FLT_ANALYZE;
if ((strm_fe(s)->fe_rsp_ana | be->be_rsp_ana) & (AN_RES_FLT_START_FE|AN_RES_FLT_START_BE))
s->req.analysers |= AN_RES_FLT_END;
}
if ((strm_fe(s)->fe_rsp_ana | be->be_rsp_ana) & (AN_RES_FLT_START_FE|AN_RES_FLT_START_BE)) {
s->res.flags |= CF_FLT_ANALYZE;
s->res.analysers |= AN_RES_FLT_END;
}
return 0;
}
@ -706,6 +712,7 @@ flt_start_analyze(struct stream *s, struct channel *chn, unsigned int an_bit)
/* Set flag on channel to tell that the channel is filtered */
chn->flags |= CF_FLT_ANALYZE;
chn->analysers |= AN_RES_FLT_END;
RESUME_FILTER_LOOP(s, chn) {
if (!(chn->flags & CF_ISRESP)) {