[Trusty][Zesty][SRU][PATCH 0/1] Fix for CVE-2017-14051

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[Trusty][Zesty][SRU][PATCH 0/1] Fix for CVE-2017-14051

Po-Hsu Lin (Sam)
From our CVE tracker, only Trusty and Zesty need this patch.

This patch can fix the integer overflow problem in the
qla2x00_sysfs_write_optrom_ctl function in drivers/scsi/qla2xxx/qla_attr.c

Dan Carpenter (1):
  scsi: qla2xxx: Fix an integer overflow in sysfs code

 drivers/scsi/qla2xxx/qla_attr.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--
2.7.4


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[CVE-2017-14051][Trusty][Zesty][SRU][PATCH 1/1] scsi: qla2xxx: Fix an integer overflow in sysfs code

Po-Hsu Lin (Sam)
From: Dan Carpenter <[hidden email]>

CVE-2017-14051

The value of "size" comes from the user.  When we add "start + size" it
could lead to an integer overflow bug.

It means we vmalloc() a lot more memory than we had intended.  I believe
that on 64 bit systems vmalloc() can succeed even if we ask it to
allocate huge 4GB buffers.  So we would get memory corruption and likely
a crash when we call ha->isp_ops->write_optrom() and ->read_optrom().

Only root can trigger this bug.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=194061

Cc: <[hidden email]>
Fixes: b7cc176c9eb3 ("[SCSI] qla2xxx: Allow region-based flash-part accesses.")
Reported-by: shqking <[hidden email]>
Signed-off-by: Dan Carpenter <[hidden email]>
Signed-off-by: Martin K. Petersen <[hidden email]>
(cherry picked from commit e6f77540c067b48dee10f1e33678415bfcc89017)
Signed-off-by: Po-Hsu Lin <[hidden email]>
---
 drivers/scsi/qla2xxx/qla_attr.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c
index 5f174b8..08dd6a3 100644
--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -303,6 +303,8 @@ qla2x00_sysfs_write_optrom_ctl(struct file *filp, struct kobject *kobj,
  return -EINVAL;
  if (start > ha->optrom_size)
  return -EINVAL;
+ if (size > ha->optrom_size - start)
+ size = ha->optrom_size - start;
 
  switch (val) {
  case 0:
@@ -324,8 +326,7 @@ qla2x00_sysfs_write_optrom_ctl(struct file *filp, struct kobject *kobj,
  return -EINVAL;
 
  ha->optrom_region_start = start;
- ha->optrom_region_size = start + size > ha->optrom_size ?
-    ha->optrom_size - start : size;
+ ha->optrom_region_size = start + size;
 
  ha->optrom_state = QLA_SREADING;
  ha->optrom_buffer = vmalloc(ha->optrom_region_size);
@@ -392,8 +393,7 @@ qla2x00_sysfs_write_optrom_ctl(struct file *filp, struct kobject *kobj,
  }
 
  ha->optrom_region_start = start;
- ha->optrom_region_size = start + size > ha->optrom_size ?
-    ha->optrom_size - start : size;
+ ha->optrom_region_size = start + size;
 
  ha->optrom_state = QLA_SWRITING;
  ha->optrom_buffer = vmalloc(ha->optrom_region_size);
--
2.7.4


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