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* [PATCH v2] vduse: vduse: fix memory corruption in vduse_dev_ioctl()
@ 2021-12-07 11:21 Dan Carpenter
  2021-12-07 11:48 ` Dan Carpenter
  0 siblings, 1 reply; 2+ messages in thread
From: Dan Carpenter @ 2021-12-07 11:21 UTC (permalink / raw)
  To: Michael S. Tsirkin; +Cc: kernel-janitors, virtualization, Xie Yongji, Eli Cohen

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.

Fixes: c8a6153b6c59 ("vduse: Introduce VDUSE - vDPA Device in Userspace")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
v2: version 1 had a reversed if statement

 drivers/vdpa/vdpa_user/vduse_dev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index c9204c62f339..1a206f95d73a 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;
 
-- 
2.20.1

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