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powerpc/bpf: Fix BPF_MOD when imm == 1 

commit 8bbc9d822421d9ac8ff9ed26a3713c9afc69d6c8 upstream.

Only ignore the operation if dividing by 1.

Fixes: 156d0e290e ("powerpc/ebpf/jit: Implement JIT compiler for extended BPF")
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Tested-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Song Liu <songliubraving@fb.com>
Acked-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c674ca18c3046885602caebb326213731c675d06.1633464148.git.naveen.n.rao@linux.vnet.ibm.com
[cascardo: use PPC_LI instead of EMIT(PPC_RAW_LI)]
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Naveen N. Rao 2021-10-06 01:55:22 +05:30 committed by Greg Kroah-Hartman
parent ca10ddbbab
commit 1cad781ecf
1 changed files with 8 additions and 2 deletions
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10
arch/powerpc/net/bpf_jit_comp64.c
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@ -408,8 +408,14 @@ static int bpf_jit_build_body(struct bpf_prog *fp, u32 *image,
case BPF_ALU64 | BPF_DIV | BPF_K: /* dst /= imm */
if (imm == 0)
return -EINVAL;
else if (imm == 1)
goto bpf_alu32_trunc;
if (imm == 1) {
if (BPF_OP(code) == BPF_DIV) {
goto bpf_alu32_trunc;
} else {
PPC_LI(dst_reg, 0);
break;
}
}
PPC_LI32(b2p[TMP_REG_1], imm);
switch (BPF_CLASS(code)) {