linux-kernel - [PATCH] perf: Don't free perf_mmap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:	Tue,  1 Dec 2009 15:05:01 -0500
From:	Kristian Høgsberg <krh@...planet.net>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] perf: Don't free perf_mmap_data until work has been done.

In the CONFIG_PERF_USE_VMALLOC case, perf_mmap_data_free() only
schedules the cleanup of the perf_mmap_data struct.  In that case
we have to wait until the work has been done before we free data.

Signed-off-by: Kristian Høgsberg <krh@...planet.net>
---
 kernel/perf_event.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 7f29643..f1854b9 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -2174,6 +2174,7 @@ static void perf_mmap_data_free(struct perf_mmap_data *data)
 	perf_mmap_free_page((unsigned long)data->user_page);
 	for (i = 0; i < data->nr_pages; i++)
 		perf_mmap_free_page((unsigned long)data->data_pages[i]);
+	kfree(data);
 }
 
 #else
@@ -2214,6 +2215,7 @@ static void perf_mmap_data_free_work(struct work_struct *work)
 		perf_mmap_unmark_page(base + (i * PAGE_SIZE));
 
 	vfree(base);
+	kfree(data);
 }
 
 static void perf_mmap_data_free(struct perf_mmap_data *data)
@@ -2319,7 +2321,6 @@ static void perf_mmap_data_free_rcu(struct rcu_head *rcu_head)
 
 	data = container_of(rcu_head, struct perf_mmap_data, rcu_head);
 	perf_mmap_data_free(data);
-	kfree(data);
 }
 
 static void perf_mmap_data_release(struct perf_event *event)
-- 
1.6.5.rc2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/