optlen == 0 indicates that the kernel should ignore BPF buffer
and use the original one from the user. We, however, forget
to free the temporary buffer that we've allocated for BPF.
Reported-by: Martin KaFai Lau <kafai@xxxxxx>
Fixes: d8fe449a9c51 ("bpf: Don't return EINVAL from {get,set}sockopt when optlen > PAGE_SIZE")
Signed-off-by: Stanislav Fomichev <sdf@xxxxxxxxxx>
---
kernel/bpf/cgroup.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index 6ec088a96302..96555a8a2c54 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -1391,12 +1391,13 @@ int __cgroup_bpf_run_filter_setsockopt(struct sock *sk, int *level,
if (ctx.optlen != 0) {
*optlen = ctx.optlen;
*kernel_optval = ctx.optval;
+ /* export and don't free sockopt buf */
+ return 0;
}
}
out:
- if (ret)
- sockopt_free_buf(&ctx);
+ sockopt_free_buf(&ctx);
return ret;
}
--
2.30.0.284.gd98b1dd5eaa7-goog
