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

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.

Cc: stable@kernel.org
Reported-by: Andrew Randrianasulu <randrik@mail.ru>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 3b93129..a9b6b5c 100644 (file)
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -862,7 +862,7 @@ 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)