From mboxrd@z Thu Jan 1 00:00:00 1970 From: dborkman@redhat.com (Daniel Borkmann) Date: Thu, 11 Sep 2014 11:36:48 +0200 Subject: [PATCH arm64-next] net: bpf: arm64: fix module memory leak when JIT image build fails Message-ID: <1410428208-2446-1-git-send-email-dborkman@redhat.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On ARM64, when the BPF JIT compiler fills the JIT image body with opcodes during translation of eBPF into ARM64 opcodes, we may fail for several reasons during that phase: one being that we jump to the notyet label for not yet supported eBPF instructions such as BPF_ST. In that case we only free offsets, but not the actual allocated target image where opcodes are being stored. Fix it by calling module_free() on dismantle time in case of errors. Signed-off-by: Daniel Borkmann Cc: Zi Shen Lim Cc: Alexei Starovoitov Cc: Will Deacon --- [ Compile-tested only. ] arch/arm64/net/bpf_jit_comp.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index 38c4296..7ae3354 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -651,8 +651,10 @@ void bpf_int_jit_compile(struct bpf_prog *prog) build_prologue(&ctx); ctx.body_offset = ctx.idx; - if (build_body(&ctx)) + if (build_body(&ctx)) { + module_free(NULL, ctx.image); goto out; + } build_epilogue(&ctx); -- 1.9.3