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ARM: net: make BPF_LD | BPF_IND instruction trigger r_X initialisation to 0.

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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>
This commit is contained in:
Nicolas Schichan 2015-10-02 15:39:12 +02:00 committed by David S. Miller
parent 598c12d0ba
commit 8690f47d6e
1 changed files with 1 additions and 0 deletions
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arch/arm/net/bpf_jit_32.c
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@ -614,6 +614,7 @@ static int build_body(struct jit_ctx *ctx)
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: