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linux-user: fix "may be used uninitialized" warnings 

Fixes:

/home/elmarco/src/qemu/linux-user/syscall.c: In function ‘do_ioctl_rt’:
/home/elmarco/src/qemu/linux-user/syscall.c:4773:9: error: ‘host_rt_dev_ptr’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
     if (*host_rt_dev_ptr != 0) {
         ^~~~~~~~~~~~~~~~
/home/elmarco/src/qemu/linux-user/syscall.c:4774:9: error: ‘target_rt_dev_ptr’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
         unlock_user((void *)*host_rt_dev_ptr,
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                     *target_rt_dev_ptr, 0);
                     ~~~~~~~~~~~~~~~~~~~~~~

Based on previous discussion from patch "linux-users/syscall: make
do_ioctl_rt safer" by Alex Bennée.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20190305151500.25038-1-marcandre.lureau@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Marc-André Lureau 2019-03-05 16:15:00 +01:00 committed by Laurent Vivier
parent ba584f1de3
commit b78c522ab9
1 changed files with 5 additions and 2 deletions
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7
linux-user/syscall.c
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@ -4733,8 +4733,8 @@ static abi_long do_ioctl_rt(const IOCTLEntry *ie, uint8_t *buf_temp,
const int *dst_offsets, *src_offsets;
int target_size;
void *argptr;
abi_ulong *target_rt_dev_ptr;
unsigned long *host_rt_dev_ptr;
abi_ulong *target_rt_dev_ptr = NULL;
unsigned long *host_rt_dev_ptr = NULL;
abi_long ret;
int i;
@ -4780,6 +4780,9 @@ 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 != NULL);
assert(target_rt_dev_ptr != NULL);
if (*host_rt_dev_ptr != 0) {
unlock_user((void *)*host_rt_dev_ptr,
*target_rt_dev_ptr, 0);