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Fix a long-existing nasty bug in the map_pages() implementation which
leads to overwriting already written pte entries with zero, *if*
map_pages() is called a second time with an end address which isn't
aligned on a pmd boundry. This happens if we want to remap only the
text segment read/write in order to run alternative patching on the
code. Fix this by exiting the loop when we read the end address.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Helge Deller <deller@xxxxxx>
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index 74842d28a7a1..ff80ffdd09c7 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -494,12 +494,9 @@ static void __init map_pages(unsigned long start_vaddr,
pte = pte_mkhuge(pte);
}
- if (address >= end_paddr) {
- if (force)
- break;
- else
- pte_val(pte) = 0;
- }
+ /* Exit loop when reaching end address. */
+ if (address >= end_paddr)
+ break;
set_pte(pg_table, pte);
