[PATCH v2] cxl: Fix error path on bad ioctl

[Frederic Barrat]

Fix error path if we can't copy user structure on CXL_IOCTL_START_WORK
ioctl. We shouldn't unlock the context status mutex as it was not
locked (yet).

Signed-off-by: Frederic Barrat <fbarrat at linux.vnet.ibm.com>
Cc: stable at vger.kernel.org
Fixes: 0712dc7e73e5 ("cxl: Fix issues when unmapping contexts")
---
Changelog:
v2: change sizeof() parameter (Vaibhav)
    tweak commit message and add 'Fixes:' (mpe)
    
 drivers/misc/cxl/file.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/misc/cxl/file.c b/drivers/misc/cxl/file.c
index 17b433f1ce23..0761271d68c5 100644
--- a/drivers/misc/cxl/file.c
+++ b/drivers/misc/cxl/file.c
@@ -159,11 +159,8 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
 
 	/* Do this outside the status_mutex to avoid a circular dependency with
 	 * the locking in cxl_mmap_fault() */
-	if (copy_from_user(&work, uwork,
-			   sizeof(struct cxl_ioctl_start_work))) {
-		rc = -EFAULT;
-		goto out;
-	}
+	if (copy_from_user(&work, uwork, sizeof(work)))
+		return -EFAULT;
 
 	mutex_lock(&ctx->status_mutex);
 	if (ctx->status != OPENED) {
-- 
2.11.0