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authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>2021-10-06 01:55:22 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2021-10-07 18:52:33 +1100
commit8bbc9d822421d9ac8ff9ed26a3713c9afc69d6c8 (patch)
treeae6286fb42226e0493f89eed1e37322dc1e176f5 /arch
parent3832ba4e283d7052b783dab8311df7e3590fed93 (diff)
downloadlinux-8bbc9d822421d9ac8ff9ed26a3713c9afc69d6c8.tar.gz
powerpc/bpf: Fix BPF_MOD when imm == 1
Only ignore the operation if dividing by 1. Fixes: 156d0e290e969c ("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
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/net/bpf_jit_comp64.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
index f06c62089b14..d67f6d62e2e1 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -391,8 +391,14 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
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 {
+ EMIT(PPC_RAW_LI(dst_reg, 0));
+ break;
+ }
+ }
PPC_LI32(b2p[TMP_REG_1], imm);
switch (BPF_CLASS(code)) {