[Qemu-devel] [PATCH 07/12] linux-user: Handle NULL argument to sched_{get, set}param

[Tom Musta]

The sched_getparam and sched_setparam system calls take a pointer
argument to a sched_param structure.  When this pointer is null,
errno should be set to EINVAL.

Signed-off-by: Tom Musta <tommu...@gmail.com>

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index f524a39..5f193cd 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7699,6 +7699,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
             struct sched_param *target_schp;
             struct sched_param schp;
 
+            if (arg2 == 0) {
+                return -TARGET_EINVAL;
+            }
             if (!lock_user_struct(VERIFY_READ, target_schp, arg2, 1))
                 goto efault;
             schp.sched_priority = tswap32(target_schp->sched_priority);
@@ -7710,6 +7713,10 @@ abi_long do_syscall(void *cpu_env, int num, abi_long 
arg1,
         {
             struct sched_param *target_schp;
             struct sched_param schp;
+
+            if (arg2 == 0) {
+                return -TARGET_EINVAL;
+            }
             ret = get_errno(sched_getparam(arg1, &schp));
             if (!is_error(ret)) {
                 if (!lock_user_struct(VERIFY_WRITE, target_schp, arg2, 0))
-- 
1.7.1