| commit | cabd1a976375780dabab888784e356f574bbaed8 | [log] [tgz] |
|---|---|---|
| author | Eric Dumazet <edumazet@google.com> | Wed Jan 28 14:15:39 2026 +0000 |
| committer | Jakub Kicinski <kuba@kernel.org> | Thu Jan 29 18:25:22 2026 -0800 |
| tree | 0167d5eced3453c9c6d1aa977f3f1c50e7eb1100 | |
| parent | 13e00fdc9236bd4d0bff4109d2983171fbcb74c4 [diff] |
net/sched: cls_u32: use skb_header_pointer_careful()
skb_header_pointer() does not fully validate negative @offset values.
Use skb_header_pointer_careful() instead.
GangMin Kim provided a report and a repro fooling u32_classify():
BUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0
net/sched/cls_u32.c:221
Fixes: fbc2e7d9cf49 ("cls_u32: use skb_header_pointer() to dereference data safely")
Reported-by: GangMin Kim <km.kim1503@gmail.com>
Closes: https://lore.kernel.org/netdev/CANn89iJkyUZ=mAzLzC4GdcAgLuPnUoivdLaOs6B9rq5_erj76w@mail.gmail.com/T/
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260128141539.3404400-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>