This is a note to let you know that I've just added the patch titled
net: x86: bpf: don't forget to free sk_filter (v2)
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-x86-bpf-don-t-forget-to-free-sk_filter-v2.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Dec 5 16:16:37 PST 2013
From: Andrey Vagin <avagin@xxxxxxxxxx>
Date: Thu, 7 Nov 2013 08:35:12 +0400
Subject: net: x86: bpf: don't forget to free sk_filter (v2)
From: Andrey Vagin <avagin@xxxxxxxxxx>
[ Upstream commit 98bbc06aabac5a2dcc46580d20c59baf8ebe479f ]
sk_filter isn't freed if bpf_func is equal to sk_run_filter.
This memory leak was introduced by v3.12-rc3-224-gd45ed4a4
"net: fix unsafe set_memory_rw from softirq".
Before this patch sk_filter was freed in sk_filter_release_rcu,
now it should be freed in bpf_jit_free.
Here is output of kmemleak:
unreferenced object 0xffff8800b774eab0 (size 128):
comm "systemd", pid 1, jiffies 4294669014 (age 124.062s)
hex dump (first 32 bytes):
00 00 00 00 0b 00 00 00 20 63 7f b7 00 88 ff ff ........ c......
60 d4 55 81 ff ff ff ff 30 d9 55 81 ff ff ff ff `.U.....0.U.....
backtrace:
[<ffffffff816444be>] kmemleak_alloc+0x4e/0xb0
[<ffffffff811845af>] __kmalloc+0xef/0x260
[<ffffffff81534028>] sock_kmalloc+0x38/0x60
[<ffffffff8155d4dd>] sk_attach_filter+0x5d/0x190
[<ffffffff815378a1>] sock_setsockopt+0x991/0x9e0
[<ffffffff81531bd6>] SyS_setsockopt+0xb6/0xd0
[<ffffffff8165f3e9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
v2: add extra { } after else
Fixes: d45ed4a4e33a ("net: fix unsafe set_memory_rw from softirq")
Acked-by: Daniel Borkmann <dborkman@xxxxxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxxxxxxxx>
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Signed-off-by: Andrey Vagin <avagin@xxxxxxxxxx>
Acked-by: Alexei Starovoitov <ast@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/net/bpf_jit_comp.c | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -788,5 +788,7 @@ void bpf_jit_free(struct sk_filter *fp)
if (fp->bpf_func != sk_run_filter) {
INIT_WORK(&fp->work, bpf_jit_free_deferred);
schedule_work(&fp->work);
+ } else {
+ kfree(fp);
}
}
Patches currently in stable-queue which might be from avagin@xxxxxxxxxx are
queue-3.12/tcp-don-t-update-snd_nxt-when-a-socket-is-switched-from-repair-mode.patch
queue-3.12/net-x86-bpf-don-t-forget-to-free-sk_filter-v2.patch
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