[PATCH 6.18 266/752] gro: change the BUG_ON() in gro_pull_from_frag0()

Sasha Levin
2026-02-28T17:51:51Z

From: Eric Dumazet <edumazet@google.com>

[ Upstream commit cbe41362be2c27e0237a94a404ae413cec9c2ad9 ]

Replace the BUG_ON() which never fired with a DEBUG_NET_WARN_ON_ONCE()

$ scripts/bloat-o-meter -t vmlinux.1 vmlinux.2
add/remove: 2/2 grow/shrink: 1/1 up/down: 370/-254 (116)
Function old new delta
gro_try_pull_from_frag0 - 196 +196
napi_gro_frags 771 929 +158
__pfx_gro_try_pull_from_frag0 - 16 +16
__pfx_gro_pull_from_frag0 16 - -16
dev_gro_receive 1514 1464 -50
gro_pull_from_frag0 188 - -188
Total: Before=22565899, After=22566015, chg +0.00%

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260122045720.1221017-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/core/gro.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/gro.c b/net/core/gro.c
index 482fa7d7f5981..ef61695fbdbb6 100644
--- a/net/core/gro.c
+++ b/net/core/gro.c
@@ -417,7 +417,7 @@ static void gro_pull_from_frag0(struct sk_buff *skb, int grow)
{
struct skb_shared_info *pinfo = skb_shinfo(skb);

- BUG_ON(skb->end - skb->tail < grow);
+ DEBUG_NET_WARN_ON_ONCE(skb->end - skb->tail < grow);

memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);

--
2.51.0