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 --- drivers/video/fbdev/sm501fb.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/video/fbdev/sm501fb.c b/drivers/video/fbdev/sm501fb.c index 9e74e8fbe074..aa3fdb89043c 100644 --- a/drivers/video/fbdev/sm501fb.c +++ b/drivers/video/fbdev/sm501fb.c @@ -1600,6 +1600,7 @@ static int sm501fb_start(struct sm501fb_info *info, 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; }