6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
commit 8fa5070833886268e4fb646daaca99f725b378e9 upstream.
On architectures with delay slot, instruction_pointer() may differ
from where exception was triggered.
Use exception_ip we just introduced to search exception tables to
get rid of the problem.
Fixes: 4bce37a68ff8 ("mips/mm: Convert to using lock_mm_and_find_vma()")
Reported-by: Xi Ruoyao <xry111@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/75e9fd7b08562ad9b456a5bdaacb7cc220311cc9.camel@xxxxxxxxxxx/
Suggested-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Cc: Salvatore Bonaccorso <carnil@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -5323,7 +5323,7 @@ static inline bool get_mmap_lock_careful
}
if (regs && !user_mode(regs)) {
- unsigned long ip = instruction_pointer(regs);
+ unsigned long ip = exception_ip(regs);
if (!search_exception_tables(ip))
return false;
}
@@ -5348,7 +5348,7 @@ static inline bool upgrade_mmap_lock_car
{
mmap_read_unlock(mm);
if (regs && !user_mode(regs)) {
- unsigned long ip = instruction_pointer(regs);
+ unsigned long ip = exception_ip(regs);
if (!search_exception_tables(ip))
return false;
}
