From: Alexei Starovoitov ast@kernel.org
[ Upstream commit 259172bb6514758ce3be1610c500b51a9f44212a ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- tools/lib/bpf/gen_loader.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/tools/lib/bpf/gen_loader.c b/tools/lib/bpf/gen_loader.c index 4ac65afc99e50..737e7cbe3e547 100644 --- 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 nr_progs, int nr_maps) { 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; }