From: Alexei Starovoitov <ast@kernel.org>
Date: Sat, 11 Dec 2021 17:16:19 -0800
Subject: libbpf: Fix gen_loader assumption on number of programs.
Patch-mainline: v5.17-rc1
Git-commit: 259172bb6514758ce3be1610c500b51a9f44212a
References: jsc#PED-1368

libbpf's obj->nr_programs includes static and global functions. That number
could be higher than the actual number of bpf programs going be loaded by
gen_loader. Passing larger nr_programs to bpf_gen__init() doesn't hurt. Those
exra stack slots will stay as zero. bpf_gen__finish() needs to check that
actual number of progs that gen_loader saw is less than or equal to
obj->nr_programs.

Fixes: ba05fd36b851 ("libbpf: Perform map fd cleanup for gen_loader in case of error")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
 tools/lib/bpf/gen_loader.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/tools/lib/bpf/gen_loader.c
+++ b/tools/lib/bpf/gen_loader.c
@@ -371,8 +371,9 @@ int bpf_gen__finish(struct bpf_gen *gen,
 {
 	int i;
 
-	if (nr_progs != gen->nr_progs || nr_maps != gen->nr_maps) {
-		pr_warn("progs/maps mismatch\n");
+	if (nr_progs < gen->nr_progs || nr_maps != gen->nr_maps) {
+		pr_warn("nr_progs %d/%d nr_maps %d/%d mismatch\n",
+			nr_progs, gen->nr_progs, nr_maps, gen->nr_maps);
 		gen->error = -EFAULT;
 		return gen->error;
 	}