This is a note to let you know that I've just added the patch titled
bpf, mips: fix off-by-one in ctx offset allocation
to the 4.4-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:
bpf-mips-fix-off-by-one-in-ctx-offset-allocation.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b4e76f7e6d3200462c6354a6ad4ae167459e61f8 Mon Sep 17 00:00:00 2001
From: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Date: Thu, 14 Jul 2016 13:57:55 +0200
Subject: bpf, mips: fix off-by-one in ctx offset allocation
From: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
commit b4e76f7e6d3200462c6354a6ad4ae167459e61f8 upstream.
Dan Carpenter reported [1] a static checker warning that ctx->offsets[]
may be accessed off by one from build_body(), since it's allocated with
fp->len * sizeof(*ctx.offsets) as length. The cBPF arm and ppc code
doesn't have this issue as claimed, so only mips seems to be affected and
should like most other JITs allocate with fp->len + 1. A few number of
JITs (x86, sparc, arm64) handle this differently, where they only require
fp->len array elements.
[1] http://www.spinics.net/lists/mips/msg64193.html
Fixes: c6610de353da ("MIPS: net: Add BPF JIT")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: ast@xxxxxxxxxx
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: linux-mips@xxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/13814/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/net/bpf_jit.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/mips/net/bpf_jit.c
+++ b/arch/mips/net/bpf_jit.c
@@ -1207,7 +1207,7 @@ void bpf_jit_compile(struct bpf_prog *fp
memset(&ctx, 0, sizeof(ctx));
- ctx.offsets = kcalloc(fp->len, sizeof(*ctx.offsets), GFP_KERNEL);
+ ctx.offsets = kcalloc(fp->len + 1, sizeof(*ctx.offsets), GFP_KERNEL);
if (ctx.offsets == NULL)
return;
Patches currently in stable-queue which might be from daniel@xxxxxxxxxxxxx are
queue-4.4/bpf-mips-fix-off-by-one-in-ctx-offset-allocation.patch
