On 2019-09-24 18:25, Jonathan Lemon wrote:
When kzalloc() failed, NULL was returned to the caller, which
tested the pointer with IS_ERR(), which didn't match, so the
pointer was used later, resulting in a NULL dereference.
Return ERR_PTR(-ENOMEM) instead of NULL.
Reported-by: syzbot+491c1b7565ba9069ecae@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 0402acd683c6 ("xsk: remove AF_XDP socket from map when the socket is released")
Signed-off-by: Jonathan Lemon <jonathan.lemon@xxxxxxxxx>
Thanks Jonathan! You beat me to it! :-P
Acked-by: Björn Töpel <bjorn.topel@xxxxxxxxx>
---
kernel/bpf/xskmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/bpf/xskmap.c b/kernel/bpf/xskmap.c
index 942c662e2eed..82a1ffe15dfa 100644
--- a/kernel/bpf/xskmap.c
+++ b/kernel/bpf/xskmap.c
@@ -37,7 +37,7 @@ static struct xsk_map_node *xsk_map_node_alloc(struct xsk_map *map,
node = kzalloc(sizeof(*node), GFP_ATOMIC | __GFP_NOWARN);
if (!node)
- return NULL;
+ return ERR_PTR(-ENOMEM);
err = xsk_map_inc(map);
if (err) {
