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target: Check for LBA + sectors wrap-around in sbc_parse_cdb

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This patch adds a check to sbc_parse_cdb() in order to detect when
an LBA + sector vs. end-of-device calculation wraps when the LBA is
sufficently large enough (eg: 0xFFFFFFFFFFFFFFFF).

Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2015-02-13 22:27:40 +00:00
parent 8e575c50a1
commit aa179935ed
1 changed files with 2 additions and 1 deletions
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3
drivers/target/target_core_sbc.c
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@ -982,7 +982,8 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
}
check_lba:
end_lba = dev->transport->get_blocks(dev) + 1;
if (cmd->t_task_lba + sectors > end_lba) {
if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
((cmd->t_task_lba + sectors) > end_lba)) {
pr_err("cmd exceeds last lba %llu "
"(lba %llu, sectors %u)\n",
end_lba, cmd->t_task_lba, sectors);