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mm: arm: fix unmatched pte_offset_map/pte_unmap error [1/1]

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PD#TV-5777

Problem:
[CVTE][T972][9.0][System]: PT190004-1300: Appear auto reboot exception
during downloading Facebook app.
get_user_pfn() may caused unmatched pte_offset_map/pte_unmap call, then
may cause bad task preempt_count and subsequently panic.

Solution:
add matched pte_offset_map/pte_unmap

Verify:
tl1

Change-Id: I98240b443b8a0fae89d0ee93701eb1bfdce51b82
Signed-off-by: Hanjie Lin <hanjie.lin@amlogic.com>
This commit is contained in:
Hanjie Lin
2019-05-16 13:38:20 +08:00
committed by Luan Yuan
parent 90fe3d8cce
commit 6ed41184fa
1 changed files with 3 additions and 1 deletions
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4
arch/arm/mm/fault.c
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@@ -153,8 +153,10 @@ static long get_user_pfn(struct mm_struct *mm, unsigned long addr)
break;
pte = pte_offset_map(pmd, addr);
if (pte_none(*pte))
if (pte_none(*pte)) {
pte_unmap(pte);
break;
}
pfn = pte_pfn(*pte);
pte_unmap(pte);