From: Akinobu Mita <akinobu.mita@gmail.com>
Date: Sun, 25 May 2014 12:43:34 +0000 (+0900)
Subject: block: fix SG_[GS]ET_RESERVED_SIZE ioctl when max_sectors is huge
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~75^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9b4231bf995996d6459c57959ead5a1829ff2c57;p=pandora-kernel.git

block: fix SG_[GS]ET_RESERVED_SIZE ioctl when max_sectors is huge

SG_GET_RESERVED_SIZE and SG_SET_RESERVED_SIZE ioctls access a reserved
buffer in bytes as int type.  The value needs to be capped at the request
queue's max_sectors.  But integer overflow is not correctly handled in
the calculation when converting max_sectors from sectors to bytes.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: linux-scsi@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
---

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