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[v1,26/28] video: fbdev: uvesafb: Fix W=1 string related warnings

Message ID 20201127195825.858960-27-sam@ravnborg.org
State Superseded
Headers show
Series drivers/video: W=1 warning fixes | expand

Commit Message

Sam Ravnborg Nov. 27, 2020, 7:58 p.m. UTC 
Two W=1 string related warnings.
- Using strncpy to copy string wihtout null-termination is not good.
  Use memcpy to copy only the relevant chars

- Fix a potential bug with a very long string, subtract one from the
  length to make room for the termination null.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Michal Januszewski <spock@gentoo.org>
Cc: linux-fbdev@vger.kernel.org
---
 drivers/video/fbdev/uvesafb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/video/fbdev/uvesafb.c b/drivers/video/fbdev/uvesafb.c
index 8ee0fc9c63cf..45dc8da191e4 100644
--- a/drivers/video/fbdev/uvesafb.c
+++ b/drivers/video/fbdev/uvesafb.c
@@ -423,7 +423,7 @@  static int uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
 	task->t.flags = TF_VBEIB;
 	task->t.buf_len = sizeof(struct vbe_ib);
 	task->buf = &par->vbe_ib;
-	strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);
+	memcpy(par->vbe_ib.vbe_signature, "VBE2", 4);
 
 	err = uvesafb_exec(task);
 	if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
@@ -1871,7 +1871,7 @@  static ssize_t v86d_show(struct device_driver *dev, char *buf)
 static ssize_t v86d_store(struct device_driver *dev, const char *buf,
 		size_t count)
 {
-	strncpy(v86d_path, buf, PATH_MAX);
+	strncpy(v86d_path, buf, PATH_MAX - 1);
 	return count;
 }
 static DRIVER_ATTR_RW(v86d);