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hfs: fix BUG on bnode parent update
authorErnesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
Tue, 30 Oct 2018 22:06:11 +0000 (15:06 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 28 Nov 2019 17:25:55 +0000 (18:25 +0100)
[ Upstream commit ef75bcc5763d130451a99825f247d301088b790b ]

hfs_brec_update_parent() may hit BUG_ON() if the first record of both a
leaf node and its parent are changed, and if this forces the parent to
be split.  It is not possible for this to happen on a valid hfs
filesystem because the index nodes have fixed length keys.

For reasons I ignore, the hfs module does have support for a number of
hfsplus features.  A corrupt btree header may report variable length
keys and trigger this BUG, so it's better to fix it.

Link: http://lkml.kernel.org/r/cf9b02d57f806217a2b1bf5db8c3e39730d8f603.1535682463.git.ernesto.mnd.fernandez@gmail.com
Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Viacheslav Dubeyko <slava@dubeyko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
fs/hfs/brec.c

index 2e71367..85dab71 100644 (file)
@@ -444,6 +444,7 @@ skip:
                        /* restore search_key */
                        hfs_bnode_read_key(node, fd->search_key, 14);
                }
+               new_node = NULL;
        }
 
        if (!rec && node->parent)