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commit f342de4e2f33e0e39165d8639387aa6c19dff660 upstream. This reverts commite0abdadcc6. core.c:nf_hook_slow assumes that the upper 16 bits of NF_DROP verdicts contain a valid errno, i.e. -EPERM, -EHOSTUNREACH or similar, or 0. Due to the reverted commit, its possible to provide a positive value, e.g. NF_ACCEPT (1), which results in use-after-free. Its not clear to me why this commit was made. NF_QUEUE is not used by nftables; "queue" rules in nftables will result in use of "nft_queue" expression. If we later need to allow specifiying errno values from userspace (do not know why), this has to call NF_DROP_GETERR and check that "err <= 0" holds true. Bug: 323034288 Fixes:e0abdadcc6("netfilter: nf_tables: accept QUEUE/DROP verdict parameters") Cc: stable@vger.kernel.org Reported-by: Notselwyn <notselwyn@pwning.tech> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> (cherry picked from commit8e34430e33) Signed-off-by: Lee Jones <joneslee@google.com> Change-Id: Ie6c699cea6f92cd4a7642f196d5f5cbffe268a6d Signed-off-by: Tao Huang <huangtao@rock-chips.com>