Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1207365

[PATCH stable] md/bitmap: return an error when bitmap superblock is corrupt.

Show all headers | View raw

commit b97e92574c0bf335db1cd2ec491d8ff5cd5d0b49 upstream
    Use separate bitmaps for each nodes in the cluster

bitmap_read_sb() validates the bitmap superblock that it reads in.
If it finds an inconsistency like a bad magic number or out-of-range
version number, it prints an error and returns, but it incorrectly
returns zero, so the array is still assembled with the (invalid) bitmap.

This means it could try to use a bitmap with a new version number which
it therefore does not understand.

This bug was introduced in 3.5 and fix as part of a larger patch in 4.1.
So the patch is suitable for any -stable kernel in that range.

Fixes: 27581e5ae01f ("md/bitmap: centralise allocation of bitmap file pages.")
Cc: stable@vger.kernel.org (v3.5..v4.1)
Signed-off-by: NeilBrown <neilb@suse.com>
Reported-by: GuoQing Jiang <gqjiang@suse.com>

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 3a5767968ba0..894fd58f75f1 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -577,6 +577,8 @@ static int bitmap_read_sb(struct bitmap *bitmap)
 	if (err)
 		return err;
 
+	err = -EINVAL;
+
 	sb = kmap_atomic(sb_page);
 
 	chunksize = le32_to_cpu(sb->chunksize);
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH stable] md/bitmap: return an error when bitmap superblock is  corrupt. NeilBrown <neilb@suse.com> - 2015-08-14 09:10 +0200
  Patch "md/bitmap: return an error when bitmap superblock is corrupt." has been added to the 3.14-stable tree <gregkh@linuxfoundation.org> - 2015-08-14 19:30 +0200
  Patch "md/bitmap: return an error when bitmap superblock is corrupt." has been added to the 3.10-stable tree <gregkh@linuxfoundation.org> - 2015-08-14 19:30 +0200
  Re: [PATCH stable] md/bitmap: return an error when bitmap superblock  is corrupt. Greg KH <greg@kroah.com> - 2015-08-14 19:30 +0200
    Re: [PATCH stable] md/bitmap: return an error when bitmap  superblock is corrupt. NeilBrown <neilb@suse.com> - 2015-08-17 02:40 +0200

csiph-web