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disp: msm: add length check for debugfs_ctrl

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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>
This commit is contained in:
Prashant Singh 2019-08-27 17:34:24 +05:30
commit 4145770b07
1 changed files with 3 additions and 0 deletions
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3
msm/sde_dbg.c
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@ -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;