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authorDave Anderson <anderson@redhat.com>2009-04-14 01:39:46 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-14 02:04:29 +0400
commiteb2e5f452a1456c7a20f7566a24d5a8f6ef3edd5 (patch)
tree934e58355313148ac212c9cc2e51663c535976d8 /fs/hfs
parent251eb40f5ccd07a905633a816fbf8f2b6b25cced (diff)
downloadlinux-eb2e5f452a1456c7a20f7566a24d5a8f6ef3edd5.tar.xz
hfs: fix memory leak when unmounting
When an HFS filesystem is unmounted, it leaks a 2-page bitmap. Also, under extreme memory pressure, it's possible that hfs_releasepage() may use a tree pointer that has not been initialized, and if so, the release request should just be rejected. [akpm@linux-foundation.org: free_pages(0) is legal, remove obvious comment] Signed-off-by: Dave Anderson <anderson@redhat.com> Tested-by: Eugene Teo <eugeneteo@kernel.sg> 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>
Diffstat (limited to 'fs/hfs')
-rw-r--r--fs/hfs/inode.c4
-rw-r--r--fs/hfs/mdb.c1
2 files changed, 5 insertions, 0 deletions
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 9435dda8f1e0..a1cbff2b4d99 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -70,6 +70,10 @@ static int hfs_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);
diff --git a/fs/hfs/mdb.c b/fs/hfs/mdb.c
index 36ca2e1a4fa3..7b6165f25fbe 100644
--- a/fs/hfs/mdb.c
+++ b/fs/hfs/mdb.c
@@ -349,6 +349,7 @@ void hfs_mdb_put(struct super_block *sb)
if (HFS_SB(sb)->nls_disk)
unload_nls(HFS_SB(sb)->nls_disk);
+ free_pages((unsigned long)HFS_SB(sb)->bitmap, PAGE_SIZE < 8192 ? 1 : 0);
kfree(HFS_SB(sb));
sb->s_fs_info = NULL;
}