Commit eb2e5f45 authored Apr 13, 2009 by Dave Anderson Committed by Linus Torvalds Apr 13, 2009

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>

parent 251eb40f

fs/hfs/inode.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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);

fs/hfs/mdb.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}