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| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2013-02-19 03:15:14 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-02-28 06:59:03 -0800 |
| commit | bdfb3335569583fd195a3a1a89380d7648a9a85f (patch) | |
| tree | 01b3dc5da797651dac0f949db3f9c4ff080f08d0 | |
| parent | 61d40262e55fe00b817fe7e28f0f4dfad6e31fca (diff) | |
| download | linux-3.10-bdfb3335569583fd195a3a1a89380d7648a9a85f.tar.gz linux-3.10-bdfb3335569583fd195a3a1a89380d7648a9a85f.tar.bz2 linux-3.10-bdfb3335569583fd195a3a1a89380d7648a9a85f.zip | |
target: Fix divide by zero bug in fabric_max_sectors for unconfigured devices
commit 7a3cf6ca1ab2a2f7161c6dec5a787fc7a5de864e upstream
This patch fixes a possible divide by zero bug when the fabric_max_sectors
device attribute is written and backend se_device failed to be successfully
configured -> enabled.
Go ahead and use block_size=512 within se_dev_set_fabric_max_sectors()
in the event of a target_configure_device() failure case, as no valid
dev->dev_attrib.block_size value will have been setup yet.
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Cc: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/target/target_core_device.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index 26c62f05975..4ecf9d61c22 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -1230,6 +1230,8 @@ int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors) int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors) { + int block_size = dev->se_sub_dev->se_dev_attrib.block_size; + if (atomic_read(&dev->dev_export_obj.obj_access_count)) { pr_err("dev[%p]: Unable to change SE Device" " fabric_max_sectors while dev_export_obj: %d count exists\n", @@ -1267,8 +1269,12 @@ int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors) /* * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks() */ + if (!block_size) { + block_size = 512; + pr_warn("Defaulting to 512 for zero block_size\n"); + } fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors, - dev->se_sub_dev->se_dev_attrib.block_size); + block_size); dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = fabric_max_sectors; pr_debug("dev[%p]: SE Device max_sectors changed to %u\n", |