lkml.org 
[lkml]   [2020]   [Feb]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 3/3] riscv: Fix crash when flushing executable ioremap regions
Date
From: Jan Kiszka <jan.kiszka@siemens.com>

Those are not backed by page structs, and pte_page is returning an
invalid pointer.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
arch/riscv/mm/cacheflush.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c
index 8930ab7278e6..9ee2c1a387cc 100644
--- a/arch/riscv/mm/cacheflush.c
+++ b/arch/riscv/mm/cacheflush.c
@@ -84,7 +84,8 @@ void flush_icache_pte(pte_t pte)
{
struct page *page = pte_page(pte);

- if (!test_and_set_bit(PG_dcache_clean, &page->flags))
+ if (!pfn_valid(pte_pfn(pte)) ||
+ !test_and_set_bit(PG_dcache_clean, &page->flags))
flush_icache_all();
}
#endif /* CONFIG_MMU */
--
2.16.4
\
 
 \ /
  Last update: 2020-02-15 12:50    [W:0.061 / U:12.536 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site