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[PULL,v3,13/22] linux-user: Conditionally Pass Attribute Pointer to mq_open()

Message ID b6ce1f6b90903961f66b0aec7be75d6c94560e40.1408712881.git.riku.voipio@linaro.org
State Accepted
Commit b6ce1f6b90903961f66b0aec7be75d6c94560e40
Headers show

Commit Message

Riku Voipio Aug. 22, 2014, 1:24 p.m. UTC 
From: Tom Musta <tommusta@gmail.com>

The mq_open system call takes an optional struct mq_attr pointer
argument in the fourth position.  This pointer is used when O_CREAT
is specified in the flags (second) argument.  It may be NULL, in
which case the queue is created with implementation defined attributes.

Change the code to properly handle the case when NULL is passed in the
arg4 position.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
---
 linux-user/syscall.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)
diff mbox

Patch

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index fa8ba8f..e754dbb 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -9115,12 +9115,16 @@  abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 #if defined(TARGET_NR_mq_open) && defined(__NR_mq_open)
     case TARGET_NR_mq_open:
         {
-            struct mq_attr posix_mq_attr;
+            struct mq_attr posix_mq_attr, *attrp;
 
             p = lock_user_string(arg1 - 1);
-            if (arg4 != 0)
+            if (arg4 != 0) {
                 copy_from_user_mq_attr (&posix_mq_attr, arg4);
-            ret = get_errno(mq_open(p, arg2, arg3, &posix_mq_attr));
+                attrp = &posix_mq_attr;
+            } else {
+                attrp = 0;
+            }
+            ret = get_errno(mq_open(p, arg2, arg3, attrp));
             unlock_user (p, arg1, 0);
         }
         break;