[PATCH] accel/ivpu: prevent uninitialized data bug in debugfs
Dan Carpenter <[email protected]>
| Newsgroups | org.kernel.vger.kernel-janitors,org.freedesktop.lists.dri-devel,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
The simple_write_to_buffer() will only initialize data starting from
the *pos offset so if it's non-zero then the first part of the buffer
uninitialized. Really, if *pos is non-zero then this code won't work
so just check for that at the start of the function.
Fixes: 320323d2e545 ("accel/ivpu: Add debugfs interface for setting HWS priority bands")
Signed-off-by: Dan Carpenter <[email protected]>
---
drivers/accel/ivpu/ivpu_debugfs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/accel/ivpu/ivpu_debugfs.c b/drivers/accel/ivpu/ivpu_debugfs.c
index 189dbe94cf14..dc20bc73c6ed 100644
--- a/drivers/accel/ivpu/ivpu_debugfs.c
+++ b/drivers/accel/ivpu/ivpu_debugfs.c
@@ -450,7 +450,7 @@ priority_bands_fops_write(struct file *file, const char __user *user_buf, size_t
u32 band;
int ret;
- if (size >= sizeof(buf))
+ if (*pos != 0 || size >= sizeof(buf))
return -EINVAL;
ret = simple_write_to_buffer(buf, sizeof(buf) - 1, pos, user_buf, size);
--
2.53.0