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ext4: handle decryption error in __ext4_block_zero_page_range() 

fscrypt_decrypt_pagecache_blocks() can fail, because it uses
skcipher_request_alloc(), which uses kmalloc(), which can fail; and also
because it calls crypto_skcipher_decrypt(), which can fail depending on
the driver that actually implements the crypto.

Therefore it's not appropriate to WARN on decryption error in
__ext4_block_zero_page_range().

Remove the WARN and just handle the error instead.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20191226154105.4704-1-ebiggers@kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Eric Biggers 2019-12-26 09:41:05 -06:00 committed by Theodore Ts'o
parent 2fdff4c843
commit 834f1565fa
1 changed files with 6 additions and 2 deletions
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8
fs/ext4/inode.c
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@ -3725,8 +3725,12 @@ static int __ext4_block_zero_page_range(handle_t *handle,
if (S_ISREG(inode->i_mode) && IS_ENCRYPTED(inode)) {
/* We expect the key to be set. */
BUG_ON(!fscrypt_has_encryption_key(inode));
WARN_ON_ONCE(fscrypt_decrypt_pagecache_blocks(
page, blocksize, bh_offset(bh)));
err = fscrypt_decrypt_pagecache_blocks(page, blocksize,
bh_offset(bh));
if (err) {
clear_buffer_uptodate(bh);
goto unlock;
}
}
}
if (ext4_should_journal_data(inode)) {