tree 3a517433ecc240bf70566fead020f5a694fcabd7
parent 3b336d6e78a46cb6a995b8fcfb28946fc3000843
author Christopher Faulet <cfaulet@haproxy.com> 1618471682 +0200
committer Christopher Faulet <cfaulet@haproxy.com> 1618992818 +0200

BUG/MINOR: http-fetch: Make method smp safe if headers were already forwarded

When method sample fetch is called, if an exotic method is found
(HTTP_METH_OTHER), when smp_prefetch_htx() is called, we must be sure the
start-line is still there. Otherwise, HAproxy may crash because of a NULL
pointer dereference, for instance if the method sample fetch is used inside
a unique-id format string. Indeed, the unique id may be generated when the
log message is emitted. At this stage, the request channel is empty.

This patch must be backported as far as 2.0. But the bug exists in all
stable versions for the legacy HTTP mode too. Thus it must be adapted to the
legacy HTTP mode and backported to all other stable versions.

(cherry picked from commit 6f97a611c83d7135d77407f7327980994413b842)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>