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ANDROID: mm: page_pinner: use put_user_page at copy_string

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copy_string calls __get_user_pages by copy_strings. Thus,
let's use put_user_page to close the false positive.

Page pinned via pid 905, ts 13725666111 ns
PFN 104188 Block 203 type Movable Flags 0xfffffc0080036(referenced|uptodate|lru|active|swapbacked)
 try_grab_page+0x144/0x160
 follow_page_mask+0x4a1/0x630
 __get_user_pages+0x24e/0x760
 __get_user_pages_remote+0xd4/0x320
 get_arg_page+0x3e/0xa0
 copy_strings.isra.0+0x201/0x380
 do_execveat_common+0x17a/0x1c0
 __x64_sys_execve+0x39/0x50
 do_syscall_64+0x33/0x80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Bug: 183414571
Signed-off-by: Minchan Kim <minchan@google.com>
Change-Id: I4c515d12f75496741cd80a24cf6ea971006f0bce
This commit is contained in:
Minchan Kim 2021-03-18 13:30:17 -07:00 • committed by Minchan Kim
commit d3b077bc15
1 changed files with 1 additions and 1 deletions
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2
fs/exec.c
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@ -232,7 +232,7 @@ static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
static void put_arg_page(struct page *page)
{
put_page(page);
put_user_page(page);
}
static void free_arg_pages(struct linux_binprm *bprm)