dma-debug: fix off-by-one error in overlap function

commit c79ee4e466dd12347f112e2af306dca35198458f upstream.

This patch fixes a bug in the overlap function which returned true if
one region ends exactly before the second region begins. This is no
overlap but the function returned true in that case.

Reported-by: Andrew Randrianasulu <randrik@mail.ru>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 2b16536..6a4e3d4 100644 (file)
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -599,7 +599,7 @@ static inline bool overlap(void *addr, u64 size, void *start, void *end)
 
        return ((addr >= start && addr < end) ||
                (addr2 >= start && addr2 < end) ||
-               ((addr < start) && (addr2 >= end)));
+               ((addr < start) && (addr2 > end)));
 }
 
 static void check_for_illegal_area(struct device *dev, void *addr, u64 size)