bpf: Initialize storage pointers to NULL to prevent freeing garbage pointer

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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: 8bad74f984 ("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

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Andrii Nakryiko 2020-03-09 15:27:55 -07:00 • committed by Alexei Starovoitov

parent 93e5fbb18c

commit 62039c30c1

1 changed files with 2 additions and 2 deletions

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kernel/bpf/cgroup.c

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