linux-kernel - [PATCH 5.4 055/270] video: fbdev: neofb: fix memory leak in neo_scan

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Date:   Mon, 17 Aug 2020 17:14:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Evgeny Novikov <novikov@...ras.ru>,
        Jani Nikula <jani.nikula@...el.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 055/270] video: fbdev: neofb: fix memory leak in neo_scan_monitor()

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

[ Upstream commit edcb3895a751c762a18d25c8d9846ce9759ed7e1 ]

neofb_probe() calls neo_scan_monitor() that can successfully allocate a
memory for info->monspecs.modedb and proceed to case 0x03. There it does
not free the memory and returns -1. neofb_probe() goes to label
err_scan_monitor, thus, it does not free this memory through calling
fb_destroy_modedb() as well. We can not go to label err_init_hw since
neo_scan_monitor() can fail during memory allocation. So, the patch frees
the memory directly for case 0x03.

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

Signed-off-by: Evgeny Novikov <novikov@...ras.ru>
Cc: Jani Nikula <jani.nikula@...el.com>
Cc: Mike Rapoport <rppt@...ux.ibm.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200630195451.18675-1-novikov@ispras.ru
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/video/fbdev/neofb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/video/fbdev/neofb.c b/drivers/video/fbdev/neofb.c
index b770946a09206..76464000933d8 100644
--- a/drivers/video/fbdev/neofb.c
+++ b/drivers/video/fbdev/neofb.c
@@ -1820,6 +1820,7 @@ static int neo_scan_monitor(struct fb_info *info)
 #else
 		printk(KERN_ERR
 		       "neofb: Only 640x480, 800x600/480 and 1024x768 panels are currently supported\n");
+		kfree(info->monspecs.modedb);
 		return -1;
 #endif
 	default:
-- 
2.25.1