This is a note to let you know that I've just added the patch titled
sm501fb: don't return zero on failure path in sm501fb_start()
to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: sm501fb-don-t-return-zero-on-failure-path-in-sm501fb_start.patch and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Thu Mar 22 14:57:32 CET 2018
From: Alexey Khoroshilov khoroshilov@ispras.ru Date: Tue, 2 May 2017 13:47:53 +0200 Subject: sm501fb: don't return zero on failure path in sm501fb_start()
From: Alexey Khoroshilov khoroshilov@ispras.ru
[ Upstream commit dc85e9a87420613b3129d5cc5ecd79c58351c546 ]
If fbmem iomemory mapping failed, sm501fb_start() breaks off initialization, deallocates resources, but returns zero. As a result, double deallocation can happen in sm501fb_stop().
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov khoroshilov@ispras.ru Cc: Tomi Valkeinen tomi.valkeinen@ti.com Signed-off-by: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/video/fbdev/sm501fb.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/video/fbdev/sm501fb.c +++ b/drivers/video/fbdev/sm501fb.c @@ -1600,6 +1600,7 @@ static int sm501fb_start(struct sm501fb_ info->fbmem = ioremap(res->start, resource_size(res)); if (info->fbmem == NULL) { dev_err(dev, "cannot remap framebuffer\n"); + ret = -ENXIO; goto err_mem_res; }
Patches currently in stable-queue which might be from khoroshilov@ispras.ru are
queue-4.4/sm501fb-don-t-return-zero-on-failure-path-in-sm501fb_start.patch