Sandro/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-09-18 22:09:30 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

perf: RISC-V: check cpu_hw_evt before dereference in overflow IRQ

Browse Source 
The overflow IRQ handler dereferences cpu_hw_evt before the null check.
Move the check first. Defensive only; the cookie is valid on the normal
path today.

Fixes: a8625217a0 ("drivers/perf: riscv: Implement SBI PMU snapshot function")
Assisted-by: DeepSeek:deepseek-v3
Signed-off-by: Xixin Liu <liuxixin@kylinos.cn>
Link: https://patch.msgid.link/fdd42c791752.v2.1786420235.git.liuxixin@kylinos.cn
Signed-off-by: Paul Walmsley <pjw@kernel.org>
This commit is contained in:
Xixin Liu
2026-09-01 19:19:48 -06:00
committed by Paul Walmsley
parent 248dbaf777
commit f643f520c4
1 changed files with 3 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/perf/riscv_pmu_sbi.c
+3 -1
View File
@@ -1086,11 +1086,13 @@ static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev)
u64 overflowed_ctrs = 0;
struct cpu_hw_events *cpu_hw_evt = dev;
u64 start_clock = sched_clock();
struct riscv_pmu_snapshot_data *sdata = cpu_hw_evt->snapshot_addr;
struct riscv_pmu_snapshot_data *sdata;
if (WARN_ON_ONCE(!cpu_hw_evt))
return IRQ_NONE;
sdata = cpu_hw_evt->snapshot_addr;
/* Firmware counter don't support overflow yet */
fidx = find_first_bit(cpu_hw_evt->used_hw_ctrs, RISCV_MAX_COUNTERS);
if (fidx == RISCV_MAX_COUNTERS) {