linux-ext4 - [Bug 205197] kernel BUG at fs/ext4/extents

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Date:   Tue, 15 Oct 2019 13:53:08 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 205197] kernel BUG at fs/ext4/extents_status.c:884

https://bugzilla.kernel.org/show_bug.cgi?id=205197

Theodore Tso (tytso@....edu) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tytso@....edu

--- Comment #1 from Theodore Tso (tytso@....edu) ---
It looks like the journal inode is corrupted but it shouldn't have BUG'ed on
you.

Can you reproduce this crash?  If so, does this fairly simple patch cause it
not to BUG?  (It will still fail to mount, but it shouldn't crash.)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index f203bf989a4c..d83b325fb54b 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -375,7 +375,7 @@ static int ext4_valid_extent(struct inode *inode, struct
ext4_extent *ext)
         *  - zero length
         *  - overflow/wrap-around
         */
-       if (lblock + len <= lblock)
+       if (lblock + (ext4_lblk_t) len <= lblock)
                return 0;
        return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len);
 }

Apologies if this is whitespace damaged, but t's a fairly simple edit to apply,
and I'm currently on a chromebook so I can't easily get a patch uploaded into
bugzilla.

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