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vduse: fix memory corruption in vduse_dev_ioctl()

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The "config.offset" comes from the user.  There needs to a check to
prevent it being out of bounds.  The "config.offset" and
"dev->config_size" variables are both type u32.  So if the offset if
out of bounds then the "dev->config_size - config.offset" subtraction
results in a very high u32 value.  The out of bounds offset can result
in memory corruption.

Fixes: c8a6153b6c ("vduse: Introduce VDUSE - vDPA Device in Userspace")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20211208103307.GA3778@kili
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Dan Carpenter 2021-12-08 13:33:07 +03:00 committed by Michael S. Tsirkin
parent 0fcfb00b28
commit ff9f9c6e74
1 changed files with 2 additions and 1 deletions
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3
drivers/vdpa/vdpa_user/vduse_dev.c
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@ -975,7 +975,8 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
break;
ret = -EINVAL;
if (config.length == 0 ||
if (config.offset > dev->config_size ||
config.length == 0 ||
config.length > dev->config_size - config.offset)
break;