fbdev: ssd1307fb: fix potential page leak in ssd1307fb_probe()

[ Upstream commit 1643126 ]

The page allocated for vmem using __get_free_pages() is not freed on the
error paths after it. Fix that by adding a corresponding __free_pages()
call to the error path.

Fixes: facd94b ("fbdev: ssd1307fb: Allocate page aligned video memory.")
Signed-off-by: Abdun Nihaal <nihaal@cse.iitm.ac.in>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Abdun Nihaal

drivers/video/fbdev/ssd1307fb.c

@@ -680,7 +680,7 @@ static int ssd1307fb_probe(struct i2c_client *client)
 	if (!ssd1307fb_defio) {
 		dev_err(dev, "Couldn't allocate deferred io.\n");
 		ret = -ENOMEM;
-		goto fb_alloc_error;
+		goto fb_defio_error;
 	}
 
 	ssd1307fb_defio->delay = HZ / refreshrate;
@@ -757,6 +757,8 @@ static int ssd1307fb_probe(struct i2c_client *client)
 		regulator_disable(par->vbat_reg);
 reset_oled_error:
 	fb_deferred_io_cleanup(info);
+fb_defio_error:
+	__free_pages(vmem, get_order(vmem_size));
 fb_alloc_error:
 	framebuffer_release(info);
 	return ret;