[PATCH] video/logo: protect against divide by zero when reading image

[Yiyuan GUO <yguoaz@xxxxxxxxx>]

In video/logo/pnmtologo.c, the function read_image can read from the
image file an integer 0 and pass it to function get_number255, leading
to a divide by zero problem.

Signed-off-by: Yiyuan GUO <yguoaz@xxxxxxxxx>
---
 drivers/video/logo/pnmtologo.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/video/logo/pnmtologo.c b/drivers/video/logo/pnmtologo.c
index 4718d7895..cc8dca5ef 100644
--- a/drivers/video/logo/pnmtologo.c
+++ b/drivers/video/logo/pnmtologo.c
@@ -118,7 +118,12 @@ static unsigned int get_number(FILE *fp)
 
 static unsigned int get_number255(FILE *fp, unsigned int maxval)
 {
-    unsigned int val = get_number(fp);
+    unsigned int val;
+
+    if (!maxval)
+	die("Corrupted maxval\n");
+
+    val = get_number(fp);
     return (255*val+maxval/2)/maxval;
 }
 
-- 
2.25.1