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authorEric Sesterhenn <snakebyte@gmx.de>2008-05-12 14:02:21 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-05-13 08:02:24 -0700
commit706322496b3a58af3cf258db2b553d6933656eef (patch)
treeec64bbc9e20be4a5b2baf9dcbb3e2201e822c97f
parent4413a0f637df4e59b934909ac388a21cfdd90e69 (diff)
Fix hfsplus oops on image without extents
Fix an oops with a corrupted hfs+ image. See http://bugzilla.kernel.org/show_bug.cgi?id=10548 for details. Problem is that we call hfs_btree_open() from hfsplus_fill_super() to set HFSPLUS_SB(sb).[ext_tree|cat_tree] Both trees are still NULL at this moment. If hfs_btree_open() fails for any reason it calls iput() on the page, which gets to hfsplus_releasepage() which tries to access HFSPLUS_SB(sb).* which is still NULL and oopses while dereferencing it. [akpm@linux-foundation.org: build fix] Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/hfsplus/inode.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index d53b2af91c2..67e1c8b467c 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -65,6 +65,8 @@ static int hfsplus_releasepage(struct page *page, gfp_t mask)
BUG();
return 0;
}
+ if (!tree)
+ return 0;
if (tree->node_size >= PAGE_CACHE_SIZE) {
nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
spin_lock(&tree->hash_lock);