tree 32dee76e54b4922eac8ab09c30b1e8399b3107aa
parent 1031be7a5fafd3a858dfaabb74d98f9ca20744a8
author NeilBrown <neilb@suse.de> 1169801823 -0800
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1169848259 -0800

[PATCH] md: avoid reading past the end of a bitmap file

In most cases we check the size of the bitmap file before reading data from
it.  However when reading the superblock, we always read the first PAGE_SIZE
bytes, which might not always be appropriate.  So limit that read to the size
of the file if appropriate.

Also, we get the count of available bytes wrong in one place, so that too can
read past the end of the file.

Cc: "yang yin" <yinyang801120@gmail.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>