ARM: net: make BPF_LD | BPF_IND instruction trigger r_X initialisation to 0.
Without this patch, if the only instructions using r_X are of the
BPF_LD | BPF_IND type, r_X would not be reset to 0, using whatever
value was there when entering the jited code. With this patch, r_X
will be correctly marked as used so it will be reset to 0 in the
prologue code.
This fix also makes the test "LD_IND byte default X" pass in the
test_bpf module when the ARM JIT is enabled.
Signed-off-by: Nicolas Schichan <nschichan@freebox.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
index 876060b..b8efb8c 100644
--- a/arch/arm/net/bpf_jit_32.c
+++ b/arch/arm/net/bpf_jit_32.c
@@ -614,6 +614,7 @@
case BPF_LD | BPF_B | BPF_IND:
load_order = 0;
load_ind:
+ update_on_xread(ctx);
OP_IMM3(ARM_ADD, r_off, r_X, k, ctx);
goto load_common;
case BPF_LDX | BPF_IMM: