Patch "MIPS: bpf: Fix uninitialised target compiler error" has been added to the 4.13-stable tree

This is a note to let you know that I've just added the patch titled

MIPS: bpf: Fix uninitialised target compiler error

to the 4.13-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:
mips-bpf-fix-uninitialised-target-compiler-error.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Matt Redfearn <[email protected]>
Date: Wed, 27 Sep 2017 09:14:58 +0100
Subject: MIPS: bpf: Fix uninitialised target compiler error

From: Matt Redfearn <[email protected]>

commit 94c3390ab84a6b449accc7351ffda4a0c17bdb92 upstream.

Compiling ebpf_jit.c with gcc 4.9 results in a (likely spurious) compiler warning, as gcc has detected that the variable "target" may be used uninitialised. Since -Werror is active, this is treated as an error and causes a kernel build failure whenever CONFIG_MIPS_EBPF_JIT is enabled.

arch/mips/net/ebpf_jit.c: In function 'build_one_insn':
arch/mips/net/ebpf_jit.c:1118:80: error: 'target' may be used uninitialized in this function [-Werror=maybe-uninitialized]

    emit_instr(ctx, j, target);
                                                                                ^

cc1: all warnings being treated as errors

Fix this by initialising "target" to 0. If it really is used uninitialised this would result in a jump to 0 and a detectable run time failure.

Patchwork: https://patchwork.linux-mips.org/patch/17375/

---
 arch/mips/net/ebpf_jit.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -679,7 +679,7 @@ static int build_one_insn(const struct b
 {
 	int src, dst, r, td, ts, mem_off, b_off;
 	bool need_swap, did_move, cmp_eq;
-	unsigned int target;
+	unsigned int target = 0;
 	u64 t64;
 	s64 t64s;
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.13/mips-bpf-fix-uninitialised-target-compiler-error.patch