]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
md: Don't read past end of bitmap when reading bitmap.
authorNeilBrown <neilb@suse.de>
Fri, 19 Dec 2008 05:25:01 +0000 (16:25 +1100)
committerNeilBrown <neilb@suse.de>
Fri, 19 Dec 2008 05:25:01 +0000 (16:25 +1100)
commita2ed9615e3222645007fc19991aedf30eed3ecfd
tree2a07cc815f5c348f085ad96a5660e3213da955f4
parent55dac3a5553b13891f0ae4bbd11920619b5436d4
md: Don't read past end of bitmap when reading bitmap.

When we read the write-intent-bitmap off the device, we currently
read a whole number of pages.
When PAGE_SIZE is 4K, this works due to the alignment we enforce
on the superblock and bitmap.
When PAGE_SIZE is 64K, this case read past the end-of-device
which causes an error.

When we write the superblock, we ensure to clip the last page
to just be the required size.  Copy that code into the read path
to just read the required number of sectors.

Signed-off-by: Neil Brown <neilb@suse.de>
Cc: stable@kernel.org
drivers/md/bitmap.c