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| author | David Disseldorp <ddiss@suse.de> | 2018-06-19 17:58:24 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-11 16:31:25 +0200 |
| commit | 04dbce2f5d77eba47369ccd349dae55f9be7f598 (patch) | |
| tree | 7f9bb41659a12803acf85eaecfbdde2dbe73e5a1 | |
| parent | 620f480fd8322d7c01dba037540cab243193ca46 (diff) | |
| download | linux-stable-04dbce2f5d77eba47369ccd349dae55f9be7f598.tar.gz linux-stable-04dbce2f5d77eba47369ccd349dae55f9be7f598.tar.bz2 linux-stable-04dbce2f5d77eba47369ccd349dae55f9be7f598.zip | |
scsi: target: Fix truncated PR-in ReadKeys response
commit 63ce3c384db26494615e3c8972bcd419ed71f4c4 upstream.
SPC5r17 states that the contents of the ADDITIONAL LENGTH field are not
altered based on the allocation length, so always calculate and pack the
full key list length even if the list itself is truncated.
According to Maged:
Yes it fixes the "Storage Spaces Persistent Reservation" test in the
Windows 2016 Server Failover Cluster validation suites when having
many connections that result in more than 8 registrations. I tested
your patch on 4.17 with iblock.
This behaviour can be tested using the libiscsi PrinReadKeys.Truncate test.
Cc: stable@vger.kernel.org
Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Tested-by: Maged Mokhtar <mmokhtar@petasan.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/target/target_core_pr.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c index 01ac306131c1..10db5656fd5d 100644 --- a/drivers/target/target_core_pr.c +++ b/drivers/target/target_core_pr.c @@ -3727,11 +3727,16 @@ core_scsi3_pri_read_keys(struct se_cmd *cmd) * Check for overflow of 8byte PRI READ_KEYS payload and * next reservation key list descriptor. */ - if ((add_len + 8) > (cmd->data_length - 8)) - break; - - put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); - off += 8; + if (off + 8 <= cmd->data_length) { + put_unaligned_be64(pr_reg->pr_res_key, &buf[off]); + off += 8; + } + /* + * SPC5r17: 6.16.2 READ KEYS service action + * The ADDITIONAL LENGTH field indicates the number of bytes in + * the Reservation key list. The contents of the ADDITIONAL + * LENGTH field are not altered based on the allocation length + */ add_len += 8; } spin_unlock(&dev->t10_pr.registration_lock); |