hfsplus: avoid crash on failed block map free

If the read fails we kmap an error code.  This doesn't end well.  Instead
print a critical error and pray.  This mirrors the rest of the fs
behaviour with critical error cases.

Acked-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jan Kara <jack@suse.cz>
Acked-by: Hin-Tak Leung <htl10@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 12 insertions, 1 deletions

diff --git a/fs/hfsplus/bitmap.c b/fs/hfsplus/bitmap.c
index 4cfbe2edd296..6feefc0cb48a 100644
--- a/fs/hfsplus/bitmap.c
+++ b/fs/hfsplus/bitmap.c
@@ -176,12 +176,14 @@ int hfsplus_block_free(struct super_block *sb, u32 offset, u32 count)
         dprint(DBG_BITMAP, "block_free: %u,%u\n", offset, count);
         /* are all of the bits in range? */
         if ((offset + count) > sbi->total_blocks)
-                return -2;
+                return -ENOENT;
 
         mutex_lock(&sbi->alloc_mutex);
         mapping = sbi->alloc_file->i_mapping;
         pnr = offset / PAGE_CACHE_BITS;
         page = read_mapping_page(mapping, pnr, NULL);
+        if (IS_ERR(page))
+                goto kaboom;
         pptr = kmap(page);
         curr = pptr + (offset & (PAGE_CACHE_BITS - 1)) / 32;
         end = pptr + PAGE_CACHE_BITS / 32;
@@ -214,6 +216,8 @@ int hfsplus_block_free(struct super_block *sb, u32 offset, u32 count)
                 set_page_dirty(page);
                 kunmap(page);
                 page = read_mapping_page(mapping, ++pnr, NULL);
+                if (IS_ERR(page))
+                        goto kaboom;
                 pptr = kmap(page);
                 curr = pptr;
                 end = pptr + PAGE_CACHE_BITS / 32;
@@ -232,4 +236,11 @@ out:
         mutex_unlock(&sbi->alloc_mutex);
 
         return 0;
+
+kaboom:
+        printk(KERN_CRIT "hfsplus: unable to mark blocks free: error %ld\n",
+                        PTR_ERR(page));
+        mutex_unlock(&sbi->alloc_mutex);
+
+        return -EIO;
 }