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i2c: fix kernel memory disclosure in dev interface

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commit 30f939feaeee23e21391cfc7b484f012eb189c3c upstream.

i2c_smbus_xfer() does not always fill an entire block, allowing
kernel stack memory disclosure through the temp variable. Clear
it before it's read to.

Signed-off-by: Vlad Tsyrklevich <vlad@tsyrklevich.net>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Vlad Tsyrklevich
2017-01-09 22:53:36 +07:00
committed by Willy Tarreau
parent b7f5924989
commit f8ddf9677f
1 changed files with 1 additions and 1 deletions
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drivers/i2c/i2c-dev.c
+1 -1
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@@ -328,7 +328,7 @@ static noinline int i2cdev_ioctl_smbus(struct i2c_client *client,
unsigned long arg)
{
struct i2c_smbus_ioctl_data data_arg;
union i2c_smbus_data temp;
union i2c_smbus_data temp = {};
int datasize, res;
if (copy_from_user(&data_arg,