linux-kernel - [PATCH] drm/nouveau/iccsense: fix memory leak

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Message-Id: <1465743394-6027-1-git-send-email-sudipm.mukherjee@gmail.com>
Date:	Sun, 12 Jun 2016 15:56:34 +0100
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Ben Skeggs <bskeggs@...hat.com>, David Airlie <airlied@...ux.ie>
Cc:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	nouveau@...ts.freedesktop.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH] drm/nouveau/iccsense: fix memory leak

In the for loop we are allocating the memory for rail everytime but
in some cases we use "continue" and in those cases the memory already
allocated for rail is leaked and we again allocate new memory for it.
Lets free the memory before continuing with the loop.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
---
 drivers/gpu/drm/nouveau/nvkm/subdev/iccsense/base.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/iccsense/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/iccsense/base.c
index 323c79a..756ff07 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/iccsense/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/iccsense/base.c
@@ -290,21 +290,28 @@ nvkm_iccsense_oneinit(struct nvkm_subdev *subdev)
 
 		switch (sensor->type) {
 		case NVBIOS_EXTDEV_INA209:
-			if (r->rail != 0)
+			if (r->rail != 0) {
+				kfree(rail);
 				continue;
+			}
 			rail->read = nvkm_iccsense_ina209_read;
 			break;
 		case NVBIOS_EXTDEV_INA219:
-			if (r->rail != 0)
+			if (r->rail != 0) {
+				kfree(rail);
 				continue;
+			}
 			rail->read = nvkm_iccsense_ina219_read;
 			break;
 		case NVBIOS_EXTDEV_INA3221:
-			if (r->rail >= 3)
+			if (r->rail >= 3) {
+				kfree(rail);
 				continue;
+			}
 			rail->read = nvkm_iccsense_ina3221_read;
 			break;
 		default:
+			kfree(rail);
 			continue;
 		}
 
-- 
1.9.1