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authorNicholas Bellinger <nab@linux-iscsi.org>2015-02-14 01:09:47 +0300
committerNicholas Bellinger <nab@linux-iscsi.org>2015-02-14 05:09:35 +0300
commit8e575c50a171f2579e367a7f778f86477dfdaf49 (patch)
tree7fa13380825c8d2d811514f6ad8f865913aa2608 /drivers/target
parent72859d91d93319c00a18c29f577e56bf73a8654a (diff)
downloadlinux-8e575c50a171f2579e367a7f778f86477dfdaf49.tar.xz
target: Add missing WRITE_SAME end-of-device sanity check
This patch adds a check to sbc_setup_write_same() to verify the incoming WRITE_SAME LBA + number of blocks does not exceed past the end-of-device. Also check for potential LBA wrap-around as well. Reported-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Martin Petersen <martin.petersen@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org # 3.8+ Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_sbc.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 11bea1952435..b26b52f441a1 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -251,6 +251,8 @@ static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
static sense_reason_t
sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
{
+ struct se_device *dev = cmd->se_dev;
+ sector_t end_lba = dev->transport->get_blocks(dev) + 1;
unsigned int sectors = sbc_get_write_same_sectors(cmd);
if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
@@ -264,6 +266,16 @@ sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *o
sectors, cmd->se_dev->dev_attrib.max_write_same_len);
return TCM_INVALID_CDB_FIELD;
}
+ /*
+ * Sanity check for LBA wrap and request past end of device.
+ */
+ if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
+ ((cmd->t_task_lba + sectors) > end_lba)) {
+ pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n",
+ (unsigned long long)end_lba, cmd->t_task_lba, sectors);
+ return TCM_ADDRESS_OUT_OF_RANGE;
+ }
+
/* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
if (flags[0] & 0x10) {
pr_warn("WRITE SAME with ANCHOR not supported\n");