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BUG/MEDIUM: trace: fix null deref in lockon mechanism since TRACE_ENABLED()

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When calling TRACE_ENABLED(), which is called by TRACE_PRINTF(), we pass
a NULL plockptr to __trace_enabled(). This argument is used when lockon
is active, and may update the pointer. This is an overlook which also
broke the lockon mechanism because now for calls from __trace(), it
dereferences a pointer pointing to NULL, and never updates it due to the
broken condition, so that trace() never sets up src->lockon_ptr.

The bug was introduced in 2.8 by commit 8f9a9704bb ("MINOR: trace: add a
TRACE_ENABLED() macro to determine if a trace is active"), so the fix must
be backported there.
This commit is contained in:
Willy Tarreau 2024-08-06 11:32:10 +02:00
parent 88a752ca78
commit b5df6b5a31
1 changed files with 1 additions and 1 deletions
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2
src/trace.c
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@ -205,7 +205,7 @@ int __trace_enabled(enum trace_level level, uint64_t mask, struct trace_source *
if (src->lockon_ptr && src->lockon_ptr != lockon_ptr)
return 0;
if (*plockptr && !src->lockon_ptr && lockon_ptr && src->state == TRACE_STATE_RUNNING)
if (plockptr && !src->lockon_ptr && lockon_ptr && src->state == TRACE_STATE_RUNNING)
*plockptr = lockon_ptr;
}