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-rw-r--r--kernel/compat.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/compat.c b/kernel/compat.c
index 44d3ab9bc668..45a0bd4747f6 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -204,7 +204,8 @@ asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t *set,
ret = sys_sigprocmask(how, set ? &s : NULL, oset ? &s : NULL);
set_fs(old_fs);
if (ret == 0)
- ret = put_user(s, oset);
+ if (oset)
+ ret = put_user(s, oset);
return ret;
}