4.13-stable review patch. If anyone has any objections, please let me know.
------------------ 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. Signed-off-by: Matt Redfearn <[email protected]> Fixes: b6bd53f9c4e8 ("MIPS: Add missing file for eBPF JIT.") Cc: James Hogan <[email protected]> Cc: David Daney <[email protected]> Cc: David S. Miller <[email protected]> Cc: Colin Ian King <[email protected]> Cc: Daniel Borkmann <[email protected]> Cc: [email protected] Cc: [email protected] Patchwork: https://patchwork.linux-mips.org/patch/17375/ Signed-off-by: Ralf Baechle <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/mips/net/ebpf_jit.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/mips/net/ebpf_jit.c +++ b/arch/mips/net/ebpf_jit.c @@ -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;
