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authorAkinobu Mita <akinobu.mita@gmail.com>2014-05-25 21:43:34 +0900
committerJens Axboe <axboe@fb.com>2014-07-01 10:43:09 -0600
commit9b4231bf995996d6459c57959ead5a1829ff2c57 (patch)
treef9c44bc06c67b67448950624da3ea80b5d4b3bd2 /block/scsi_ioctl.c
parent63f264965947ac6299452711f614f086955b2515 (diff)
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>
Diffstat (limited to 'block/scsi_ioctl.c')
-rw-r--r--block/scsi_ioctl.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 14695c6221c8..bda1497add4c 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -82,9 +82,18 @@ static int sg_set_timeout(struct request_queue *q, int __user *p)
return err;
}
+static int max_sectors_bytes(struct request_queue *q)
+{
+ unsigned int max_sectors = queue_max_sectors(q);
+
+ max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
+
+ return max_sectors << 9;
+}
+
static int sg_get_reserved_size(struct request_queue *q, int __user *p)
{
- unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
+ int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
return put_user(val, p);
}
@@ -98,10 +107,8 @@ static int sg_set_reserved_size(struct request_queue *q, int __user *p)
if (size < 0)
return -EINVAL;
- if (size > (queue_max_sectors(q) << 9))
- size = queue_max_sectors(q) << 9;
- q->sg_reserved_size = size;
+ q->sg_reserved_size = min(size, max_sectors_bytes(q));
return 0;
}