* [PATCH] perf/x86: Fix NULL dereference in handle_pmi_common()
@ 2025-12-12 16:51 Tinu K Cheriya
0 siblings, 0 replies; only message in thread
From: Tinu K Cheriya @ 2025-12-12 16:51 UTC (permalink / raw)
To: peterz; +Cc: acme, tglx, linux-perf-users, linux-kernel, Tinu K Cheriya
syzbot reported a NULL pointer dereference in handle_pmi_common()
when the event pointer retrieved from cpuc->events[] is NULL but
is_pebs_counter_event_group() is called unconditionally.
Add a defensive NULL check before calling is_pebs_counter_event_group().
bug:220855
Signed-off-by: Tinu K Cheriya <tinuk11c@gmail.com>
---
arch/x86/events/intel/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 1e3ce060d..ee693946d 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3397,7 +3397,7 @@ static int handle_pmi_common(struct pt_regs *regs, u64 status)
*
* The PEBS buffer has to be drained before handling the A-PMI
*/
- if(!event)
+ if (!event)
continue;
if (is_pebs_counter_event_group(event))
static_call(x86_pmu_drain_pebs)(regs, &data);
--
2.34.1
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