Third argument represents lenght not second.
If second 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 second argument.
Signed-off-by: Lena Djokic <lena.djo...@rt-rk.com>
---
linux-user/syscall.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 61c4126..3faf4f0 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -9426,7 +9426,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
#if defined(TARGET_NR_syslog)
case TARGET_NR_syslog:
{
- int len = arg2;
+ int len = arg3;
switch (arg1) {
case TARGET_SYSLOG_ACTION_CLOSE: /* Close log */
@@ -9450,13 +9450,13 @@ abi_long do_syscall(void *cpu_env, int num, abi_long
arg1,
goto fail;
}
ret = 0;
- if (len == 0) {
- break;
- }
- p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
- if (!p) {
- ret = -TARGET_EFAULT;
- goto fail;
+ p = NULL;
+ if (arg2) {
+ p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
+ if (!p) {
+ ret = -TARGET_EFAULT;
+ goto fail;
+ }
}
ret = get_errno(sys_syslog((int)arg1, p, (int)arg3));
unlock_user(p, arg2, arg3);
--
2.7.4
