drivers/firmware/tegra/bpmp-debugfs.c:335:11-18: WARNING opportunity for memdup_user

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   86cfccb66937dd6cbf26ed619958b9e587e6a115
commit: 5e37b9c137ee5a3a9dc2815ca51f71746c2609a6 firmware: tegra: Add support for in-band debug
date:   3 weeks ago
config: arm64-randconfig-c003-20200807 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>


coccinelle warnings: (new ones prefixed by >>)

>> drivers/firmware/tegra/bpmp-debugfs.c:335:11-18: WARNING opportunity for memdup_user

vim +335 drivers/firmware/tegra/bpmp-debugfs.c

   320	
   321	static ssize_t bpmp_debug_store(struct file *file, const char __user *buf,
   322			size_t count, loff_t *f_pos)
   323	{
   324		struct inode *inode = file_inode(file);
   325		struct tegra_bpmp *bpmp = inode->i_private;
   326		char *databuf = NULL;
   327		char fnamebuf[256];
   328		const char *filename;
   329		ssize_t err;
   330	
   331		filename = get_filename(bpmp, file, fnamebuf, sizeof(fnamebuf));
   332		if (!filename)
   333			return -ENOENT;
   334	
 > 335		databuf = kmalloc(count, GFP_KERNEL);
   336		if (!databuf)
   337			return -ENOMEM;
   338	
   339		if (copy_from_user(databuf, buf, count)) {
   340			err = -EFAULT;
   341			goto free_ret;
   342		}
   343	
   344		err = mrq_debug_write(bpmp, filename, databuf, count);
   345	
   346	free_ret:
   347		kfree(databuf);
   348	
   349		return err ?: count;
   350	}
   351	

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Attachment: .config.gz
Description: application/gzip