linux-kernel - [PATCH][next] drm: simpledrm: Fix use after free issues

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Message-Id: <20210512203051.299026-1-colin.king@canonical.com>
Date:   Wed, 12 May 2021 21:30:51 +0100
From:   Colin King <colin.king@...onical.com>
To:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <maxime@...no.tech>,
        dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] drm: simpledrm: Fix use after free issues

From: Colin Ian King <colin.king@...onical.com>

There are two occurrances where objects are being free'd via
a put call and yet they are being referenced after this. Fix these
by adding in the missing continue statement so that the put on the
end of the loop is skipped over.

Addresses-Coverity: ("Use after free")
Fixes: 11e8f5fd223b ("drm: Add simpledrm driver")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/gpu/drm/tiny/simpledrm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c
index 2bdb477d9326..eae748394b00 100644
--- a/drivers/gpu/drm/tiny/simpledrm.c
+++ b/drivers/gpu/drm/tiny/simpledrm.c
@@ -298,6 +298,7 @@ static int simpledrm_device_init_clocks(struct simpledrm_device *sdev)
 			drm_err(dev, "failed to enable clock %u: %d\n",
 				i, ret);
 			clk_put(clock);
+			continue;
 		}
 		sdev->clks[i] = clock;
 	}
@@ -415,6 +416,7 @@ static int simpledrm_device_init_regulators(struct simpledrm_device *sdev)
 			drm_err(dev, "failed to enable regulator %u: %d\n",
 				i, ret);
 			regulator_put(regulator);
+			continue;
 		}
 
 		sdev->regulators[i++] = regulator;
-- 
2.30.2