Revert "ecryptfs: replace BUG_ON with error handling code"

This reverts commit 2cbb8c2d443d4741c2f8c8bb7f09a87a8ebdc69d.

Because of recent interactions with developers from @umn.edu, all
commits from them have been recently re-reviewed to ensure if they were
correct or not.

Upon review, this commit was found to be incorrect for the reasons
below, so it must be reverted.  It will be fixed up "correctly" in a
later kernel change.

The original commit log for this change was incorrect, no "error
handling code" was added, things will blow up just as badly as before if
any of these cases ever were true.  As this BUG_ON() never fired, and
most of these checks are "obviously" never going to be true, let's just
revert to the original code for now until this gets unwound to be done
correctly in the future.

Cc: Aditya Pakki <pakki001@umn.edu>
Fixes: 2cbb8c2d443d ("ecryptfs: replace BUG_ON with error handling code")
Cc: stable <stable@vger.kernel.org>
Acked-by: Tyler Hicks <code@tyhicks.com>
Link: https://lore.kernel.org/r/20210503115736.2104747-49-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 345f8061e3b4abf424ea4079e2d01ac620ac13d3..b1aa993784f777b53cd7d9c126f78e0f20bf5de7 100644 (file)
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -296,10 +296,8 @@ static int crypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
        struct extent_crypt_result ecr;
        int rc = 0;
 
-       if (!crypt_stat || !crypt_stat->tfm
-              || !(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
-               return -EINVAL;
-
+       BUG_ON(!crypt_stat || !crypt_stat->tfm
+              || !(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED));
        if (unlikely(ecryptfs_verbosity > 0)) {
                ecryptfs_printk(KERN_DEBUG, "Key size [%zd]; key:\n",
                                crypt_stat->key_size);