From: Ofir Bitton <obitton@habana.ai>
Date: Thu, 30 Jul 2020 07:00:10 +0000 (+0300)
Subject: habanalabs: Validate user address before mapping
X-Git-Tag: v5.9-rc3~30^2^2~11
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bf6d10963ed0db290e9aba05a97bfc4c72c7c0e4;p=thirdparty%2Fkernel%2Flinux.git

habanalabs: Validate user address before mapping

User address must be validated before driver performs address map.

Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
---

diff --git a/drivers/misc/habanalabs/common/command_buffer.c b/drivers/misc/habanalabs/common/command_buffer.c
index 7c38c4f7f9c02..a8004911c9771 100644
--- a/drivers/misc/habanalabs/common/command_buffer.c
+++ b/drivers/misc/habanalabs/common/command_buffer.c
@@ -10,6 +10,7 @@
 
 #include <linux/mm.h>
 #include <linux/slab.h>
+#include <linux/uaccess.h>
 #include <linux/genalloc.h>
 
 static void cb_fini(struct hl_device *hdev, struct hl_cb *cb)
@@ -300,7 +301,7 @@ int hl_cb_mmap(struct hl_fpriv *hpriv, struct vm_area_struct *vma)
 	struct hl_device *hdev = hpriv->hdev;
 	struct hl_cb *cb;
 	phys_addr_t address;
-	u32 handle;
+	u32 handle, user_cb_size;
 	int rc;
 
 	handle = vma->vm_pgoff;
@@ -314,7 +315,8 @@ int hl_cb_mmap(struct hl_fpriv *hpriv, struct vm_area_struct *vma)
 	}
 
 	/* Validation check */
-	if ((vma->vm_end - vma->vm_start) != ALIGN(cb->size, PAGE_SIZE)) {
+	user_cb_size = vma->vm_end - vma->vm_start;
+	if (user_cb_size != ALIGN(cb->size, PAGE_SIZE)) {
 		dev_err(hdev->dev,
 			"CB mmap failed, mmap size 0x%lx != 0x%x cb size\n",
 			vma->vm_end - vma->vm_start, cb->size);
@@ -322,6 +324,16 @@ int hl_cb_mmap(struct hl_fpriv *hpriv, struct vm_area_struct *vma)
 		goto put_cb;
 	}
 
+	if (!access_ok((void __user *) (uintptr_t) vma->vm_start,
+							user_cb_size)) {
+		dev_err(hdev->dev,
+			"user pointer is invalid - 0x%lx\n",
+			vma->vm_start);
+
+		rc = -EINVAL;
+		goto put_cb;
+	}
+
 	spin_lock(&cb->lock);
 
 	if (cb->mmap) {