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f2fs: prevent creating duplicate encrypted filenames
As described in "fscrypt: add fscrypt_is_nokey_name()", it's possible to create a duplicate filename in an encrypted directory by creating a file concurrently with adding the directory's encryption key. Fix this bug on f2fs by rejecting no-key dentries in f2fs_add_link(). Note that the weird check for the current task in f2fs_do_add_link() seems to make this bug difficult to reproduce on f2fs. Fixes: 9ea9716 ("f2fs crypto: add filename encryption for f2fs_add_link") Cc: [email protected] Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Eric Biggers <[email protected]>
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