diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2021-12-08 13:33:07 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2021-12-08 14:53:15 -0500 |
| commit | ff9f9c6e74848170fcb45c8403c80d661484c8c9 (patch) | |
| tree | 2a15197e082639024a5ee608c3b228e3dc8cec2b | |
| parent | 0fcfb00b28c0b7884635dacf38e46d60bf3d4eb1 (diff) | |
| download | linux-misc-ff9f9c6e74848170fcb45c8403c80d661484c8c9.tar.gz | |
vduse: fix memory corruption in vduse_dev_ioctl()
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: c8a6153b6c59 ("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
| -rw-r--r-- | drivers/vdpa/vdpa_user/vduse_dev.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index c9204c62f339c3..1a206f95d73a8a 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -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; |