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vfs: don't copy things to user space holding the rcu readlock

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Oops.  That wasn't very smart.  We don't actually need the RCU lock any
more by the time we copy the cwd string to user space, but I had
stupidly surrounded the whole thing with it.

Introduced by commit 8b19e34188 ("vfs: make getcwd() get the root and
pwd path under rcu")

Is-a-big-hairy-idiot: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2013-09-12 11:57:01 -07:00
parent 5223161dc0
commit ff812d7242
1 changed files with 2 additions and 1 deletions
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3
fs/dcache.c
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@ -3067,6 +3067,7 @@ SYSCALL_DEFINE2(getcwd, char __user *, buf, unsigned long, size)
prepend(&cwd, &buflen, "\0", 1);
error = prepend_path(&pwd, &root, &cwd, &buflen);
br_read_unlock(&vfsmount_lock);
rcu_read_unlock();
if (error < 0)
goto out;
@ -3087,10 +3088,10 @@ SYSCALL_DEFINE2(getcwd, char __user *, buf, unsigned long, size)
}
} else {
br_read_unlock(&vfsmount_lock);
rcu_read_unlock();
}
out:
rcu_read_unlock();
free_page((unsigned long) page);
return error;
}