disp: msm: add length check for debugfs_ctrl



Add check for length of debugfs_ctrl value before
copying to user buffer invoked during read operation.

Change-Id: I199110992921d0ae3791129fa0bf1e51dcca9107
Signed-off-by: Prashant Singh <prasin@codeaurora.org>

parent 06f8bcc1

msm/sde_dbg.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -3675,6 +3675,9 @@ static ssize_t sde_dbg_ctrl_read(struct file file, char __user buff,
		pr_debug("%s: ctrl:0x%x len:0x%zx\n",
		__func__, sde_dbg_base.debugfs_ctrl, len);

		if (len < 0 \|\| len >= sizeof(buf))
		return 0;

		if ((count < sizeof(buf)) \|\| copy_to_user(buff, buf, len)) {
		pr_err("error copying the buffer! count:0x%zx\n", count);
		return -EFAULT;