ucounts: In set_cred_ucounts assume new->ucounts is non-NULL
Any cred that is destined for use by commit_creds must have a non-NULL cred->ucounts field. Only curing credential construction is a NULL cred->ucounts valid. Only abort_creds, put_cred, and put_cred_rcu needs to deal with a cred with a NULL ucount. As set_cred_ucounts is non of those case don't confuse people by handling something that can not happen. Link: https://lkml.kernel.org/r/871r4irzds.fsf_-_@disp2133 Tested-by: Yu Zhao <yuzhao@google.com> Reviewed-by: Alexey Gladkov <legion@kernel.org> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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@ -676,15 +676,14 @@ int set_cred_ucounts(struct cred *new)
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* This optimization is needed because alloc_ucounts() uses locks
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* for table lookups.
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*/
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if (old_ucounts && old_ucounts->ns == new->user_ns && uid_eq(old_ucounts->uid, new->euid))
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if (old_ucounts->ns == new->user_ns && uid_eq(old_ucounts->uid, new->euid))
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return 0;
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if (!(new_ucounts = alloc_ucounts(new->user_ns, new->euid)))
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return -EAGAIN;
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new->ucounts = new_ucounts;
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if (old_ucounts)
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put_ucounts(old_ucounts);
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put_ucounts(old_ucounts);
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return 0;
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}
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