6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Cong Wang <cong.wang@xxxxxxxxxxxxx>
[ Upstream commit 9ecc4d858b92c1bb0673ad9c327298e600c55659 ]
skb_network_offset() and skb_transport_offset() can be negative when
they are called after we pull the transport header, for example, when
we use eBPF sockmap at the point of ->sk_data_ready().
__bpf_skb_min_len() uses an unsigned int to get these offsets, this
leads to a very large number which then causes bpf_skb_change_tail()
failed unexpectedly.
Fix this by using a signed int to get these offsets and ensure the
minimum is at least zero.
Fixes: 5293efe62df8 ("bpf: add bpf_skb_change_tail helper")
Signed-off-by: Cong Wang <cong.wang@xxxxxxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Acked-by: John Fastabend <john.fastabend@xxxxxxxxx>
Link: https://lore.kernel.org/bpf/20241213034057.246437-2-xiyou.wangcong@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/core/filter.c | 21 +++++++++++++++------
1 file changed, 15 insertions(+), 6 deletions(-)
diff --git a/net/core/filter.c b/net/core/filter.c
index 34cefd85aaf6..cf87e29a5e8f 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3695,13 +3695,22 @@ static const struct bpf_func_proto bpf_skb_adjust_room_proto = {
static u32 __bpf_skb_min_len(const struct sk_buff *skb)
{
- u32 min_len = skb_network_offset(skb);
+ int offset = skb_network_offset(skb);
+ u32 min_len = 0;
- if (skb_transport_header_was_set(skb))
- min_len = skb_transport_offset(skb);
- if (skb->ip_summed == CHECKSUM_PARTIAL)
- min_len = skb_checksum_start_offset(skb) +
- skb->csum_offset + sizeof(__sum16);
+ if (offset > 0)
+ min_len = offset;
+ if (skb_transport_header_was_set(skb)) {
+ offset = skb_transport_offset(skb);
+ if (offset > 0)
+ min_len = offset;
+ }
+ if (skb->ip_summed == CHECKSUM_PARTIAL) {
+ offset = skb_checksum_start_offset(skb) +
+ skb->csum_offset + sizeof(__sum16);
+ if (offset > 0)
+ min_len = offset;
+ }
return min_len;
}
--
2.39.5
