video: fbdev: au1200fb: Fix a potential double free

If 'fb_alloc_cmap()' fails, 'fbi->pseudo_palette' is freed and an error
code is returned by 'au1200fb_init_fbinfo()'.
The only caller, 'au1200fb_drv_probe()' goes to an error handling path
where resources allocated in 'fb_alloc_cmap()' are freed.
This leads to a double free of 'fbi->pseudo_palette'.

Fix it by letting the caller free all resources in case of failure in
'au1200fb_init_fbinfo()'.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

diff --git a/drivers/video/fbdev/au1200fb.c b/drivers/video/fbdev/au1200fb.c
index 5f04b40..a5facc2 100644 (file)
--- a/drivers/video/fbdev/au1200fb.c
+++ b/drivers/video/fbdev/au1200fb.c
@@ -1553,7 +1553,6 @@ static int au1200fb_init_fbinfo(struct au1200fb_device *fbdev)
        if (fb_alloc_cmap(&fbi->cmap, AU1200_LCD_NBR_PALETTE_ENTRIES, 0) < 0) {
                print_err("Fail to allocate colormap (%d entries)",
                           AU1200_LCD_NBR_PALETTE_ENTRIES);
-               kfree(fbi->pseudo_palette);
                return -EFAULT;
        }