[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2] xen/arm: Fix the issue in cmp_mmio_handler used in find_mmio_handler
This function returns true/false based on whether the key value is in the range (start, start+size). However, it should check against (start, start+size-1) because start+size falls outside the range. This resulted in returning a wrong mmio_handler for a given mmio address which happened to be start+size. This bug was introduced when the mmio region search was switched from linear search to binary search in the following commit: 8047e09 "xen/arm: io: Use binary search for mmio handler lookup". This change may have to be back-ported to 4.8 also. Signed-off-by: Bhupinder Thakur <bhupinder.thakur@xxxxxxxxxx> --- CC: Stefano Stabellini <sstabellini@xxxxxxxxxx> CC: Julien Grall <julien.grall@xxxxxxx> xen/arch/arm/io.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/arch/arm/io.c b/xen/arch/arm/io.c index e216128..c748d8f 100644 --- a/xen/arch/arm/io.c +++ b/xen/arch/arm/io.c @@ -79,7 +79,7 @@ static int cmp_mmio_handler(const void *key, const void *elem) if ( handler0->addr < handler1->addr ) return -1; - if ( handler0->addr > (handler1->addr + handler1->size) ) + if ( handler0->addr >= (handler1->addr + handler1->size) ) return 1; return 0; -- 2.7.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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