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[PULL,v2,14/23] linux-user: Conditionally Pass Attribute Pointer to mq_open()

Message ID b59ce8b275b71abeae4b1c0741f52486bcbdcce1.1408436940.git.riku.voipio@linaro.org
State Superseded
Headers show

Commit Message

Riku Voipio Aug. 19, 2014, 8:32 a.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(-)
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Patch

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index db40829..c9a9d3d 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -9185,12 +9185,16 @@  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;