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mm/memory: Use exception ip to search exception tables 

[ Upstream commit 8fa5070833886268e4fb646daaca99f725b378e9 ]

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: 4bce37a68f ("mips/mm: Convert to using lock_mm_and_find_vma()")
Reported-by: Xi Ruoyao <xry111@xry111.site>
Link: https://lore.kernel.org/r/75e9fd7b08562ad9b456a5bdaacb7cc220311cc9.camel@xry111.site/
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jiaxun Yang 2024-02-02 12:30:28 +00:00 committed by Greg Kroah-Hartman
parent fdd12a80f6
commit 94d34a6861
1 changed files with 2 additions and 2 deletions
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4
mm/memory.c
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@ -5315,7 +5315,7 @@ static inline bool get_mmap_lock_carefully(struct mm_struct *mm, struct pt_regs
return true;
if (regs && !user_mode(regs)) {
unsigned long ip = instruction_pointer(regs);
unsigned long ip = exception_ip(regs);
if (!search_exception_tables(ip))
return false;
}
@ -5340,7 +5340,7 @@ static inline bool upgrade_mmap_lock_carefully(struct mm_struct *mm, struct pt_r
{
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;
}