subpage_register() expects "end" to be the last byte in the mapping.
Registering a non-page-aligned memory region that extends up to or
beyond a page boundary causes subpage_register() to silently fail
through the (end >= PAGE_SIZE) check.
This bug does not cause noticeable problems for mappings that do not
extend to a page boundary, though they do register an extra byte.
Signed-off-by: Tyler Hall <tylerwh...@gmail.com>
---
exec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/exec.c b/exec.c
index feb4795..27b100c 100644
--- a/exec.c
+++ b/exec.c
@@ -2271,7 +2271,7 @@ static void register_subpage(MemoryRegionSection *section)
subpage = container_of(existing->mr, subpage_t, iomem);
}
start = section->offset_within_address_space & ~TARGET_PAGE_MASK;
- end = start + section->size;
+ end = start + section->size - 1;
subpage_register(subpage, start, end, phys_section_add(section));
}
--
1.7.11
