From c0d1379a19c3dde3c32be50164997d246241c1e4 Mon Sep 17 00:00:00 2001 From: Sasha Levin Date: Sat, 13 Sep 2014 00:06:30 -0400 Subject: [PATCH] net: bpf: correctly handle errors in sk_attach_filter() Commit "net: bpf: make eBPF interpreter images read-only" has changed bpf_prog to be vmalloc()ed but never handled some of the errors paths of the old code. On error within sk_attach_filter (which userspace can easily trigger), we'd kfree() the vmalloc()ed memory, and leak the internal bpf_work_struct. Signed-off-by: Sasha Levin Acked-by: Daniel Borkmann Acked-by: Hannes Frederic Sowa Signed-off-by: David S. Miller --- net/core/filter.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/core/filter.c b/net/core/filter.c index 601f28de7311..fcd3f6742a6a 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -1047,7 +1047,7 @@ int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) return -ENOMEM; if (copy_from_user(prog->insns, fprog->filter, fsize)) { - kfree(prog); + __bpf_prog_free(prog); return -EFAULT; } @@ -1055,7 +1055,7 @@ int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) err = bpf_prog_store_orig_filter(prog, fprog); if (err) { - kfree(prog); + __bpf_prog_free(prog); return -ENOMEM; } -- 2.20.1