[PATCH] missing sanity check in ppdev

96027053 · Dave Jones · Linus Torvalds · e70f1205 · 96027053
Commit 96027053 authored Oct 07, 2002 by Dave Jones Committed by Linus Torvalds Oct 07, 2002
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drivers/char/ppdev.c drivers/char/ppdev.c +4 -0

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--- a/drivers/char/ppdev.c
+++ b/drivers/char/ppdev.c
@@ -118,6 +118,10 @@ static ssize_t pp_read (struct file * file, char * buf, size_t count,
 		return -EINVAL;
 	}

+	/* Trivial case. */
+	if (count == 0)
+		return 0;
+
 	kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
 	if (!kbuffer) {
 		return -ENOMEM;