Messages in this thread Patch in this message | | | Date | Mon, 19 Dec 2022 13:33:36 -0800 | Subject | Re: [syzbot] KASAN: use-after-free Read in put_pmu_ctx | From | sdf@google ... |
| |
On 12/19, syzbot wrote: > Hello,
> syzbot tried to test the proposed patch but the build/boot failed:
> failed to apply patch: > checking file kernel/events/core.c > patch: **** unexpected end of file in patch
> Tested on:
> commit: 13e3c779 Merge tag 'for-netdev' of https://git.kernel... > git tree: > https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git > dashboard link: > https://syzkaller.appspot.com/bug?extid=b8e8c01c8ade4fe6e48f > compiler: > patch: > https://syzkaller.appspot.com/x/patch.diff?x=15861a9f880000
Let's try again with hopefully a better formatted patch..
#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git 13e3c7793e2f
diff --git a/kernel/events/core.c b/kernel/events/core.c index e47914ac8732..bbff551783e1 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -12689,7 +12689,8 @@ SYSCALL_DEFINE5(perf_event_open, return event_fd;
err_context: - /* event->pmu_ctx freed by free_event() */ + put_pmu_ctx(event->pmu_ctx); + event->pmu_ctx = NULL; /* _free_event() */ err_locked: mutex_unlock(&ctx->mutex); perf_unpin_context(ctx);
| |