From aab08c1aac01097815fbcf10fce7021d2396a31f Mon Sep 17 00:00:00 2001
From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Date: Thu, 21 Apr 2022 08:13:38 +0200
Subject: [PATCH] dmaengine: idxd: Fix the error handling path in idxd_cdev_register()
Git-commit: aab08c1aac01097815fbcf10fce7021d2396a31f
Patch-mainline: v5.19-rc1
References: git-fixes

If a call to alloc_chrdev_region() fails, the already allocated resources
are leaking.

Add the needed error handling path to fix the leak.

Fixes: 42d279f9137a ("dmaengine: idxd: add char driver to expose submission portal to userland")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/1b5033dcc87b5f2a953c413f0306e883e6114542.1650521591.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/dma/idxd/cdev.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c
index b670b75885ad..bd44293804d1 100644
--- a/drivers/dma/idxd/cdev.c
+++ b/drivers/dma/idxd/cdev.c
@@ -369,10 +369,16 @@ int idxd_cdev_register(void)
 		rc = alloc_chrdev_region(&ictx[i].devt, 0, MINORMASK,
 					 ictx[i].name);
 		if (rc)
-			return rc;
+			goto err_free_chrdev_region;
 	}
 
 	return 0;
+
+err_free_chrdev_region:
+	for (i--; i >= 0; i--)
+		unregister_chrdev_region(ictx[i].devt, MINORMASK);
+
+	return rc;
 }
 
 void idxd_cdev_remove(void)
-- 
2.35.3