From 3df109b388de35680fa0ec299419686afb79dde6 Mon Sep 17 00:00:00 2001 From: "Liam R. Howlett" Date: Tue, 16 Mar 2021 15:59:23 -0400 Subject: [PATCH] sys rcu fix Signed-off-by: Liam R. Howlett --- kernel/sys.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/sys.c b/kernel/sys.c index 7f6204c2c86e..1f1835c177b1 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1862,6 +1862,7 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd) MA_STATE(mas, &mm->mm_mt, 0, 0); mmap_read_lock(mm); + rcu_read_lock(); mas_for_each(&mas, vma, ULONG_MAX) { if (!vma->vm_file) continue; @@ -1870,6 +1871,7 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd) goto exit_err; } + rcu_read_unlock(); mmap_read_unlock(mm); fput(exe_file); } @@ -1884,6 +1886,7 @@ exit: fdput(exe); return err; exit_err: + rcu_read_unlock(); mmap_read_unlock(mm); fput(exe_file); goto exit; -- 2.50.1