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bpf: Fix NULL pointer dereference in __btf_resolve_helper_id()

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Prevent __btf_resolve_helper_id() from dereferencing `btf_vmlinux`
as NULL. This patch fixes the following syzbot bug:

    https://syzkaller.appspot.com/bug?id=f823224ada908fa5c207902a5a62065e53ca0fcc

Reported-by: syzbot+ee09bda7017345f1fbe6@syzkaller.appspotmail.com
Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200714180904.277512-1-yepeilin.cs@gmail.com
This commit is contained in:
Peilin Ye 2020-07-14 14:09:04 -04:00 committed by Daniel Borkmann
parent 55b244221c
commit 5b801dfb7f
1 changed files with 5 additions and 0 deletions
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kernel/bpf/btf.c
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@ -4058,6 +4058,11 @@ static int __btf_resolve_helper_id(struct bpf_verifier_log *log, void *fn,
const char *tname, *sym;
u32 btf_id, i;
if (!btf_vmlinux) {
bpf_log(log, "btf_vmlinux doesn't exist\n");
return -EINVAL;
}
if (IS_ERR(btf_vmlinux)) {
bpf_log(log, "btf_vmlinux is malformed\n");
return -EINVAL;