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fork: normalize copy_process() error return before ERR_PTR(). #1778

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fork: normalize copy_process() error return before ERR_PTR(). #1778

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7 changes: 7 additions & 0 deletions kernel/fork.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2854,6 +2854,13 @@ __latent_entropy struct task_struct *copy_process(
spin_lock_irq(&current->sighand->siglock);
hlist_del_init(&delayed.node);
spin_unlock_irq(&current->sighand->siglock);
/*
* The error path returns ERR_PTR(retval), which requires retval to be a
* negative errno in the range [-MAX_ERRNO, -1]. Normalize unexpected
* values to avoid returning non-error pointers to callers.
*/
if (unlikely(retval >= 0 || retval < -MAX_ERRNO))
retval = -EINVAL;
return ERR_PTR(retval);
}

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