Integer overflow in target_core_device.c

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Linux kernel commit 8a9ebe717a133ba7bc90b06047f43cc6b8bcb8b3

attrib->max_unmap_lba_count = (q->limits.max_discard_sectors << 9)

Since max_discard_sectors is 32-bit, there may be integer overflow,
making wrong max_unmap_lba_count.

For example, LVM Thin provisioning reports that it have 16 GB maximal
discard block.

Exactly the same bug in DRBD9, I have already reported.

-- 
Segmentation fault