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bpf: Clear per_cpu pointers during bpf_prog_realloc 

bpf_prog_realloc copies contents of struct bpf_prog.
The pointers have to be cleared before freeing old struct.

Reported-by: Ilya Leoshkevich <iii@linux.ibm.com>
Fixes: 700d4796ef ("bpf: Optimize program stats")
Fixes: ca06f55b90 ("bpf: Add per-program recursion prevention mechanism")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexei Starovoitov 2021-02-11 19:35:00 -08:00
parent 6fdd671baa
commit 1336c66247
1 changed files with 2 additions and 0 deletions
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2
kernel/bpf/core.c
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@ -245,6 +245,8 @@ struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
* reallocated structure.
*/
fp_old->aux = NULL;
fp_old->stats = NULL;
fp_old->active = NULL;
__bpf_prog_free(fp_old);
}