nvmet: avoid integer overflow in the discard code

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Although I'm not sure whether it is a good idea to support large discard
commands, I think integer overflow for discard ranges larger than 4 GB
should be avoided. This patch avoids that smatch reports the following:

drivers/nvme/target/io-cmd-file.c:249:1 nvmet_file_execute_discard() warn: should '((range.nlb)) << req->ns->blksize_shift' be a 64 bit type?

Fixes: d5eff33ee6 ("nvmet: add simple file backed ns support")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

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Bart Van Assche 2018-10-08 14:28:52 -07:00 • committed by Christoph Hellwig

parent 0d3ebdec93

commit 8eacd1bd21

1 changed files with 2 additions and 1 deletions

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drivers/nvme/target/io-cmd-file.c

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