[Qemu-devel] [PATCH for 2.10 27/35] syscall: fix dereference of undefined pointer

[Philippe Mathieu-Daudé]

Clang's scan-build-5.0 reports:

linux-user/syscall.c:5581:9: warning: Dereference of undefined pointer value
    if (*host_rt_dev_ptr != 0) {
        ^~~~~~~~~~~~~~~~

Reported-by: Clang Static Analyzer
Suggested-by: Laurent Vivier <lviv...@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
---
 linux-user/syscall.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index fcd20fa276..e79b5baec4 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -5524,7 +5524,7 @@ static abi_long do_ioctl_rt(const IOCTLEntry *ie, uint8_t 
*buf_temp,
     int target_size;
     void *argptr;
     abi_ulong *target_rt_dev_ptr;
-    unsigned long *host_rt_dev_ptr;
+    unsigned long *host_rt_dev_ptr = NULL;
     abi_long ret;
     int i;
 
@@ -5570,6 +5570,7 @@ static abi_long do_ioctl_rt(const IOCTLEntry *ie, uint8_t 
*buf_temp,
     unlock_user(argptr, arg, 0);
 
     ret = get_errno(safe_ioctl(fd, ie->host_cmd, buf_temp));
+    assert(host_rt_dev_ptr);
     if (*host_rt_dev_ptr != 0) {
         unlock_user((void *)*host_rt_dev_ptr,
                     *target_rt_dev_ptr, 0);
-- 
2.13.3