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parisc: Fix map_pages() to not overwrite existing pte entries

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commit 3c229b3f2d upstream.

Fix a long-existing small 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 for example if we want to remap only the text segment read/write
in order to run alternative patching on the code. Exiting the loop when we
reach the end address fixes this.

Cc: stable@vger.kernel.org
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Helge Deller 2018-10-12 22:37:46 +02:00 committed by Greg Kroah-Hartman
parent dcfc49721c
commit 72f6b9c076
1 changed files with 2 additions and 6 deletions
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8
arch/parisc/mm/init.c
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@ -494,12 +494,8 @@ 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;
}
if (address >= end_paddr)
break;
set_pte(pg_table, pte);