linux-kernel - [PATCH AUTOSEL 5.4 09/45] video: fbdev: savage: fix memory leak on error handling path in probe

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Message-Id: <20200810191153.3794446-9-sashal@kernel.org>
Date:   Mon, 10 Aug 2020 15:11:17 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Evgeny Novikov <novikov@...ras.ru>,
        Antonino Daplas <adaplas@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Sasha Levin <sashal@...nel.org>, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.4 09/45] video: fbdev: savage: fix memory leak on error handling path in probe

From: Evgeny Novikov <novikov@...ras.ru>

[ Upstream commit e8d35898a78e34fc854ed9680bc3f9caedab08cd ]

savagefb_probe() calls savage_init_fb_info() that can successfully
allocate memory for info->pixmap.addr but then fail when
fb_alloc_cmap() fails. savagefb_probe() goes to label failed_init and
does not free allocated memory. It is not valid to go to label
failed_mmio since savage_init_fb_info() can fail during memory
allocation as well. So, the patch free allocated memory on the error
handling path in savage_init_fb_info() itself.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <novikov@...ras.ru>
Cc: Antonino Daplas <adaplas@...il.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200619162136.9010-1-novikov@ispras.ru
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/video/fbdev/savage/savagefb_driver.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/video/fbdev/savage/savagefb_driver.c b/drivers/video/fbdev/savage/savagefb_driver.c
index 512789f5f8848..d5d22d9c0f562 100644
--- a/drivers/video/fbdev/savage/savagefb_driver.c
+++ b/drivers/video/fbdev/savage/savagefb_driver.c
@@ -2158,6 +2158,8 @@ static int savage_init_fb_info(struct fb_info *info, struct pci_dev *dev,
 			info->flags |= FBINFO_HWACCEL_COPYAREA |
 				       FBINFO_HWACCEL_FILLRECT |
 				       FBINFO_HWACCEL_IMAGEBLIT;
+		else
+			kfree(info->pixmap.addr);
 	}
 #endif
 	return err;
-- 
2.25.1