lib/scatterlist.c: fix kunmap() argument in sg_miter_stop()

commit f652c521e0bec2e70cf123f47e80117a7e6ed139 upstream.

kunmap() takes as argument the struct page that orginally got kmap()'d,
however the sg_miter_stop() function passed it the kernel virtual address
instead, resulting in weird stuff.

Somehow I ended up fixing this bug by accident while looking for a bug in
the same area.

Reported-by: kerneloops.org
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index 8d2688ff1352e7ca9c20c6ac28292216fb8640ac..b7b449dafbe5abb59fe06982e337cb31c6a7eaeb 100644 (file)
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -395,7 +395,7 @@ void sg_miter_stop(struct sg_mapping_iter *miter)
                        WARN_ON(!irqs_disabled());
                        kunmap_atomic(miter->addr, KM_BIO_SRC_IRQ);
                } else
-                       kunmap(miter->addr);
+                       kunmap(miter->page);
 
                miter->page = NULL;
                miter->addr = NULL;