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| author | Andrii Nakryiko <andriin@fb.com> | 2020-03-10 01:27:55 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-03-10 05:56:48 +0300 |
| commit | 62039c30c19dcab96621e074aeeb90da7100def7 (patch) | |
| tree | 7eaf14dc8ca1e1c1751eb54448f63f7ad35bc002 /kernel/bpf/cgroup.c | |
| parent | 93e5fbb18cec70b3b5c614f67b65388829113bdd (diff) | |
| download | linux-62039c30c19dcab96621e074aeeb90da7100def7.tar.xz | |
bpf: Initialize storage pointers to NULL to prevent freeing garbage pointer
Local storage array isn't initialized, so if cgroup storage allocation fails
for BPF_CGROUP_STORAGE_SHARED, error handling code will attempt to free
uninitialized pointer for BPF_CGROUP_STORAGE_PERCPU storage type. Avoid this
by always initializing storage pointers to NULLs.
Fixes: 8bad74f9840f ("bpf: extend cgroup bpf core to allow multiple cgroup storage types")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200309222756.1018737-1-andriin@fb.com
Diffstat (limited to 'kernel/bpf/cgroup.c')
| -rw-r--r-- | kernel/bpf/cgroup.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c index 9a500fadbef5..b2bc4c335bb1 100644 --- a/kernel/bpf/cgroup.c +++ b/kernel/bpf/cgroup.c @@ -302,8 +302,8 @@ int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog, u32 saved_flags = (flags & (BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI)); struct list_head *progs = &cgrp->bpf.progs[type]; struct bpf_prog *old_prog = NULL; - struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE], - *old_storage[MAX_BPF_CGROUP_STORAGE_TYPE] = {NULL}; + struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = {}; + struct bpf_cgroup_storage *old_storage[MAX_BPF_CGROUP_STORAGE_TYPE] = {}; struct bpf_prog_list *pl, *replace_pl = NULL; enum bpf_cgroup_storage_type stype; int err; |