I got a null-ptr-deref report:
BUG: kernel NULL pointer dereference, address:
0000000000000000
...
RIP: 0010:fb_destroy_modelist+0x38/0x100
...
Call Trace:
ufx_usb_probe.cold+0x2b5/0xac1 [smscufx]
usb_probe_interface+0x1aa/0x3c0 [usbcore]
really_probe+0x167/0x460
...
ret_from_fork+0x1f/0x30
If fb_alloc_cmap() fails in ufx_usb_probe(), fb_destroy_modelist() will
be called to destroy modelist in the error handling path. But modelist
has not been initialized yet, so it will result in null-ptr-deref.
Initialize modelist before calling fb_alloc_cmap() to fix this bug.
Fixes:
3c8a63e22a08 ("Add support for SMSC UFX6000/7000 USB display adapters")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Helge Deller <deller@gmx.de>
info->par = dev;
info->pseudo_palette = dev->pseudo_palette;
info->fbops = &ufx_ops;
+ INIT_LIST_HEAD(&info->modelist);
retval = fb_alloc_cmap(&info->cmap, 256, 0);
if (retval < 0) {
INIT_DELAYED_WORK(&dev->free_framebuffer_work,
ufx_free_framebuffer_work);
- INIT_LIST_HEAD(&info->modelist);
-
retval = ufx_reg_read(dev, 0x3000, &id_rev);
check_warn_goto_error(retval, "error %d reading 0x3000 register from device", retval);
dev_dbg(dev->gdev, "ID_REV register value 0x%08x", id_rev);