fbdev: imsttfb: Fix use after free bug in imsttfb_probe

A use-after-free bug may occur if init_imstt invokes framebuffer_release
and free the info ptr. The caller, imsttfb_probe didn't notice that and
still keep the ptr as private data in pdev.

If we remove the driver which will call imsttfb_remove to make cleanup,
UAF happens.

Fix it by return error code if bad case happens in init_imstt.

Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/drivers/video/fbdev/imsttfb.c b/drivers/video/fbdev/imsttfb.c
index bea4564..975dd68 100644 (file)
--- a/drivers/video/fbdev/imsttfb.c
+++ b/drivers/video/fbdev/imsttfb.c
@@ -1347,7 +1347,7 @@ static const struct fb_ops imsttfb_ops = {
        .fb_ioctl       = imsttfb_ioctl,
 };
 
-static void init_imstt(struct fb_info *info)
+static int init_imstt(struct fb_info *info)
 {
        struct imstt_par *par = info->par;
        __u32 i, tmp, *ip, *end;
@@ -1420,7 +1420,7 @@ static void init_imstt(struct fb_info *info)
            || !(compute_imstt_regvals(par, info->var.xres, info->var.yres))) {
                printk("imsttfb: %ux%ux%u not supported\n", info->var.xres, info->var.yres, info->var.bits_per_pixel);
                framebuffer_release(info);
-               return;
+               return -ENODEV;
        }
 
        sprintf(info->fix.id, "IMS TT (%s)", par->ramdac == IBM ? "IBM" : "TVP");
@@ -1456,12 +1456,13 @@ static void init_imstt(struct fb_info *info)
 
        if (register_framebuffer(info) < 0) {
                framebuffer_release(info);
-               return;
+               return -ENODEV;
        }
 
        tmp = (read_reg_le32(par->dc_regs, SSTATUS) & 0x0f00) >> 8;
        fb_info(info, "%s frame buffer; %uMB vram; chip version %u\n",
                info->fix.id, info->fix.smem_len >> 20, tmp);
+       return 0;
 }
 
 static int imsttfb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
@@ -1529,10 +1530,10 @@ static int imsttfb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
        if (!par->cmap_regs)
                goto error;
        info->pseudo_palette = par->palette;
-       init_imstt(info);
-
-       pci_set_drvdata(pdev, info);
-       return 0;
+       ret = init_imstt(info);
+       if (!ret)
+               pci_set_drvdata(pdev, info);
+       return ret;
 
 error:
        if (par->dc_regs)