6.6-stable review patch. If anyone has any objections, please let me know.
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From: Menglong Dong menglong8.dong@gmail.com
[ Upstream commit fea3f5e83c5cd80a76d97343023a2f2e6bd862bf ]
The error that returned by ftrace_set_filter_ip() in register_fentry() is not handled properly. Just fix it.
Fixes: 00963a2e75a8 ("bpf: Support bpf_trampoline on functions with IPMODIFY (e.g. livepatch)") Signed-off-by: Menglong Dong dongml2@chinatelecom.cn Acked-by: Song Liu song@kernel.org Link: https://lore.kernel.org/r/20251110120705.1553694-1-dongml2@chinatelecom.cn Signed-off-by: Alexei Starovoitov ast@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/bpf/trampoline.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/bpf/trampoline.c b/kernel/bpf/trampoline.c index b6024fc903490..f8a58b4130701 100644 --- a/kernel/bpf/trampoline.c +++ b/kernel/bpf/trampoline.c @@ -216,7 +216,9 @@ static int register_fentry(struct bpf_trampoline *tr, void *new_addr) }
if (tr->func.ftrace_managed) { - ftrace_set_filter_ip(tr->fops, (unsigned long)ip, 0, 1); + ret = ftrace_set_filter_ip(tr->fops, (unsigned long)ip, 0, 1); + if (ret) + return ret; ret = register_ftrace_direct(tr->fops, (long)new_addr); } else { ret = bpf_arch_text_poke(ip, BPF_MOD_CALL, NULL, new_addr);