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libbpf: Fix gen_loader assumption on number of programs.

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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: ba05fd36b8 ("libbpf: Perform map fd cleanup for gen_loader in case of error")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexei Starovoitov 2021-12-11 17:16:19 -08:00
parent 77ab714f00
commit 259172bb65
1 changed files with 3 additions and 2 deletions

5
tools/lib/bpf/gen_loader.c
View File

@ -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;
}