bpf: Fix regsafe() for pointers to packet

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[ Upstream commit a8502a79e8 ]

In case rold->reg->range == BEYOND_PKT_END && rcur->reg->range == N
regsafe() may return true which may lead to current state with
valid packet range not being explored. Fix the bug.

Fixes: 6d94e741a8 ("bpf: Support for pointers beyond pkt_end.")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Amery Hung <ameryhung@gmail.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/20260331204228.26726-1-alexei.starovoitov@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Alexei Starovoitov 2026-03-31 13:42:28 -07:00 • committed by Greg Kroah-Hartman

parent bb5a8db7ae

commit 37db6b9726

1 changed files with 6 additions and 1 deletions

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kernel/bpf/verifier.c

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