USB: usbtest: prevent a divide by zero bug · 564e69893c - Gogs

USB: usbtest: prevent a divide by zero bug

If param->length is zero, then this could lead to a divide by zero bug
later in the function when we do: size %= max;

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Dan Carpenter 12 years ago

parent

fb4e98ab63

commit

564e69893c

1 changed files with 3 additions and 0 deletions

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							+ 3
							
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drivers/usb/misc/usbtest.c
							 
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				@@ -423,6 +423,9 @@ alloc_sglist(int nents, int max, int vary)
			
				 	unsigned		i;
			
				 	unsigned		size = max;
			
				+	if (max == 0)
			
				+		return NULL;
			
				+
			
				 	sg = kmalloc_array(nents, sizeof *sg, GFP_KERNEL);
			
				 	if (!sg)
			
				 		return NULL;