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authorAlexander Usyskin <alexander.usyskin@intel.com>2014-02-17 14:13:22 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-02-18 19:05:07 +0100
commita27a76d3c07de08a0d0d298b6bc280c5b820e997 (patch)
tree35189df75481fe1422219ec453723548bed60680 /drivers/misc
parentmei: wd and amthif use mei_cl_ api for dis/connection (diff)
downloadlinux-a27a76d3c07de08a0d0d298b6bc280c5b820e997.tar.xz
linux-a27a76d3c07de08a0d0d298b6bc280c5b820e997.zip
mei: fix potential read outside of array bounds
Drop not-very-useful check and with this fix read on index that can be after array end. Cleanup search function as byproduct. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/mei/client.c23
1 files changed, 10 insertions, 13 deletions
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index 8afba0534779..539e861abc1e 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -29,20 +29,21 @@
* mei_me_cl_by_uuid - locate index of me client
*
* @dev: mei device
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
* returns me client index or -ENOENT if not found
*/
int mei_me_cl_by_uuid(const struct mei_device *dev, const uuid_le *uuid)
{
- int i, res = -ENOENT;
+ int i;
for (i = 0; i < dev->me_clients_num; ++i)
if (uuid_le_cmp(*uuid,
- dev->me_clients[i].props.protocol_name) == 0) {
- res = i;
- break;
- }
+ dev->me_clients[i].props.protocol_name) == 0)
+ return i;
- return res;
+ return -ENOENT;
}
@@ -60,16 +61,12 @@ int mei_me_cl_by_uuid(const struct mei_device *dev, const uuid_le *uuid)
int mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
{
int i;
+
for (i = 0; i < dev->me_clients_num; i++)
if (dev->me_clients[i].client_id == client_id)
- break;
- if (WARN_ON(dev->me_clients[i].client_id != client_id))
- return -ENOENT;
+ return i;
- if (i == dev->me_clients_num)
- return -ENOENT;
-
- return i;
+ return -ENOENT;
}