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authorEric Dumazet <edumazet@google.com>2018-02-13 15:33:52 -0800
committerAlexei Starovoitov <ast@kernel.org>2018-02-13 19:19:15 -0800
commit952fad8e323975c4e826b659087d2648777594a6 (patch)
treeb975a4eda33630af0c7e11d8b76d1184eb6ba5d9 /kernel
parent9a3efb6b661f71d5675369ace9257833f0e78ef3 (diff)
downloadlinux-952fad8e323975c4e826b659087d2648777594a6.tar.bz2
bpf: fix sock_map_alloc() error path
In case user program provides silly parameters, we want a map_alloc() handler to return an error, not a NULL pointer, otherwise we crash later in find_and_alloc_map() Fixes: 1aa12bdf1bfb ("bpf: sockmap, add sock close() hook to remove socks") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Acked-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/bpf/sockmap.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/bpf/sockmap.c b/kernel/bpf/sockmap.c
index 48c33417d13c..a927e89dad6e 100644
--- a/kernel/bpf/sockmap.c
+++ b/kernel/bpf/sockmap.c
@@ -521,8 +521,8 @@ static struct smap_psock *smap_init_psock(struct sock *sock,
static struct bpf_map *sock_map_alloc(union bpf_attr *attr)
{
struct bpf_stab *stab;
- int err = -EINVAL;
u64 cost;
+ int err;
if (!capable(CAP_NET_ADMIN))
return ERR_PTR(-EPERM);
@@ -547,6 +547,7 @@ static struct bpf_map *sock_map_alloc(union bpf_attr *attr)
/* make sure page count doesn't overflow */
cost = (u64) stab->map.max_entries * sizeof(struct sock *);
+ err = -EINVAL;
if (cost >= U32_MAX - PAGE_SIZE)
goto free_stab;