diff options
| author | Mike Christie <michael.christie@oracle.com> | 2022-06-27 21:23:25 -0500 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2022-07-07 16:38:14 -0400 |
| commit | ccd3f449052449a917a3e577d8ba0368f43b8f29 (patch) | |
| tree | 92fcfb4b40910560ad306fb846e1733b0dacd4b7 | |
| parent | fce54ed027577517df1e74b7d54dc2b1bd536887 (diff) | |
scsi: target: Fix WRITE_SAME No Data Buffer crash
In newer version of the SBC specs, we have a NDOB bit that indicates there
is no data buffer that gets written out. If this bit is set using commands
like "sg_write_same --ndob" we will crash in target_core_iblock/file's
execute_write_same handlers when we go to access the se_cmd->t_data_sg
because its NULL.
This patch adds a check for the NDOB bit in the common WRITE SAME code
because we don't support it. And, it adds a check for zero SG elements in
each handler in case the initiator tries to send a normal WRITE SAME with
no data buffer.
Link: https://lore.kernel.org/r/20220628022325.14627-2-michael.christie@oracle.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/target/target_core_file.c | 3 | ||||
| -rw-r--r-- | drivers/target/target_core_iblock.c | 4 | ||||
| -rw-r--r-- | drivers/target/target_core_sbc.c | 6 |
3 files changed, 13 insertions, 0 deletions
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c index e68f1cc8ef98..6c8d8b051bfd 100644 --- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -448,6 +448,9 @@ fd_execute_write_same(struct se_cmd *cmd) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } + if (!cmd->t_data_nents) + return TCM_INVALID_CDB_FIELD; + if (cmd->t_data_nents > 1 || cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) { pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c index 378c80313a0f..1ed9381751e6 100644 --- a/drivers/target/target_core_iblock.c +++ b/drivers/target/target_core_iblock.c @@ -494,6 +494,10 @@ iblock_execute_write_same(struct se_cmd *cmd) " backends not supported\n"); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } + + if (!cmd->t_data_nents) + return TCM_INVALID_CDB_FIELD; + sg = &cmd->t_data_sg[0]; if (cmd->t_data_nents > 1 || diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index ca1b2312d6e7..f6132836eb38 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -312,6 +312,12 @@ sbc_setup_write_same(struct se_cmd *cmd, unsigned char flags, struct sbc_ops *op pr_warn("WRITE SAME with ANCHOR not supported\n"); return TCM_INVALID_CDB_FIELD; } + + if (flags & 0x01) { + pr_warn("WRITE SAME with NDOB not supported\n"); + return TCM_INVALID_CDB_FIELD; + } + /* * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting * translated into block discard requests within backend code. |