diff options
| author | Lena Djokic <Lena.Djokic@rt-rk.com> | 2016-11-24 17:08:58 +0100 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2017-02-14 17:18:03 +0100 |
| commit | 2640077527aef6f799215b336e1ed212843d3753 (patch) | |
| tree | a42dfc1d1e765ff8e5537b4eaa269c0da31153b3 /linux-user | |
| parent | 77c6850fd7412289122bc21f3b01310c014d98d4 (diff) | |
linux-user: Fix mq_open
If fourth argument is NULL it should be passed without
using lock_user function which would, in that case, return
EFAULT, and system call supports passing NULL as fourth argument.
Signed-off-by: Lena Djokic <Lena.Djokic@rt-rk.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Diffstat (limited to 'linux-user')
| -rw-r--r-- | linux-user/syscall.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 3e88dd129c..c1d6f76814 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -11583,17 +11583,22 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, case TARGET_NR_mq_open: { struct mq_attr posix_mq_attr; + struct mq_attr *pposix_mq_attr; int host_flags; host_flags = target_to_host_bitmask(arg2, fcntl_flags_tbl); - if (copy_from_user_mq_attr(&posix_mq_attr, arg4) != 0) { - goto efault; + pposix_mq_attr = NULL; + if (arg4) { + if (copy_from_user_mq_attr(&posix_mq_attr, arg4) != 0) { + goto efault; + } + pposix_mq_attr = &posix_mq_attr; } p = lock_user_string(arg1 - 1); if (!p) { goto efault; } - ret = get_errno(mq_open(p, host_flags, arg3, &posix_mq_attr)); + ret = get_errno(mq_open(p, host_flags, arg3, pposix_mq_attr)); unlock_user (p, arg1, 0); } break; |