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authorDaniel Borkmann <daniel@iogearbox.net>2018-06-29 00:34:58 +0300
committerAlexei Starovoitov <ast@kernel.org>2018-06-29 20:47:35 +0300
commitf605ce5eb26ac934fb8106d75d46a2c875a2bf23 (patch)
tree97ee4598527128b1a2f4e4f0795ddbb4f62499d2 /arch/s390/net
parent18d405af30bf6506bf2fc49056de7691c949812e (diff)
downloadlinux-f605ce5eb26ac934fb8106d75d46a2c875a2bf23.tar.xz
bpf, s390: fix potential memleak when later bpf_jit_prog fails
If we would ever fail in the bpf_jit_prog() pass that writes the actual insns to the image after we got header via bpf_jit_binary_alloc() then we also need to make sure to free it through bpf_jit_binary_free() again when bailing out. Given we had prior bpf_jit_prog() passes to initially probe for clobbered registers, program size and to fill in addrs arrray for jump targets, this is more of a theoretical one, but at least make sure this doesn't break with future changes. Fixes: 054623105728 ("s390/bpf: Add s390x eBPF JIT compiler backend") Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'arch/s390/net')
-rw-r--r--arch/s390/net/bpf_jit_comp.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index d2db8acb1a55..5f0234ec8038 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -1286,6 +1286,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
goto free_addrs;
}
if (bpf_jit_prog(&jit, fp)) {
+ bpf_jit_binary_free(header);
fp = orig_fp;
goto free_addrs;
}