[Qemu-devel] [V3 PATCH 07/13] linux-user: Handle NULL sched_param argument to sched_*

[Tom Musta <tommusta@gmail.com>]

The sched_getparam, sched_setparam and sched_setscheduler 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 <tommusta@gmail.com>
---
V2: Including sched_setscheduler in the changes per Peter Maydell's
review.

 linux-user/syscall.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 79fb3cb..49b8a07 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7702,6 +7702,9 @@ 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);
@@ -7713,6 +7716,10 @@ 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))
@@ -7726,6 +7733,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
         {
             struct sched_param *target_schp;
             struct sched_param schp;
+            if (arg3 == 0) {
+                return -TARGET_EINVAL;
+            }
             if (!lock_user_struct(VERIFY_READ, target_schp, arg3, 1))
                 goto efault;
             schp.sched_priority = tswap32(target_schp->sched_priority);
-- 
1.7.1