From: Jan Kara <jack@suse.cz>
Date: Tue, 3 Dec 2013 10:20:06 +0000 (+0100)
Subject: ext2: Fix oops in ext2_get_block() called from ext2_quota_write()
X-Git-Tag: v3.2.55~45
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f5b4f2e824dec9808d55287576a7b83d80bae937;p=pandora-kernel.git

ext2: Fix oops in ext2_get_block() called from ext2_quota_write()

commit df4e7ac0bb70abc97fbfd9ef09671fc084b3f9db upstream.

ext2_quota_write() doesn't properly setup bh it passes to
ext2_get_block() and thus we hit assertion BUG_ON(maxblocks == 0) in
ext2_get_blocks() (or we could actually ask for mapping arbitrary number
of blocks depending on whatever value was on stack).

Fix ext2_quota_write() to properly fill in number of blocks to map.

Reviewed-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reported-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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