Re: [Qemu-devel] [PATCH v4 06/10] slirp/misc: check return value of malloc()

["Alex Bennée" <alex.bennee@linaro.org>]

zhanghailiang writes:

> Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
> ---
>  slirp/misc.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/slirp/misc.c b/slirp/misc.c
> index b8eb74c..9b457ad 100644
> --- a/slirp/misc.c
> +++ b/slirp/misc.c
> @@ -55,6 +55,10 @@ int add_exec(struct ex_list **ex_ptr, int do_pty, char *exec,
>  
>  	tmp_ptr = *ex_ptr;
>  	*ex_ptr = (struct ex_list *)malloc(sizeof(struct ex_list));
> +    if (*ex_ptr == NULL) {
> +        fprintf(stderr, "Error: malloc failed\n");
> +        return -1;
> +    }

Your indenting has gone a bit weird there.

>  	(*ex_ptr)->ex_fport = port;
>  	(*ex_ptr)->ex_addr = addr;
>  	(*ex_ptr)->ex_pty = do_pty;
> @@ -236,8 +240,9 @@ strdup(str)
>  	char *bptr;
>  
>  	bptr = (char *)malloc(strlen(str)+1);
> -	strcpy(bptr, str);
> -
> +    if (bptr) {
> +        strcpy(bptr, str);
> +    }
>  	return bptr;
>  }
>  #endif

Again use of g_malloc would remove the need for this. HACKING section 3
says:

3. Low level memory management

Use of the malloc/free/realloc/calloc/valloc/memalign/posix_memalign
APIs is not allowed in the QEMU codebase. Instead of these routines,
use the GLib memory allocation routines g_malloc/g_malloc0/g_new/
g_new0/g_realloc/g_free or QEMU's qemu_memalign/qemu_blockalign/qemu_vfree
APIs.

Please note that g_malloc will exit on allocation failure, so there
is no need to test for failure (as you would have to with malloc).
Calling g_malloc with a zero size is valid and will return NULL.


-- 
Alex Bennée