[PATCH v2] mtd: ubi: Added a check for ubi_num

[Zhihao Cheng]

在 2024/12/2 17:36, Denis Arefev 写道:
> Added a check for ubi_num for negative numbers
> If the variable ubi_num takes negative values then we get:
> 
> qemu-system-arm ... -append "ubi.mtd=0,0,0,-22222345" ...
> [    0.745065]  ubi_attach_mtd_dev from ubi_init+0x178/0x218
> [    0.745230]  ubi_init from do_one_initcall+0x70/0x1ac
> [    0.745344]  do_one_initcall from kernel_init_freeable+0x198/0x224
> [    0.745474]  kernel_init_freeable from kernel_init+0x18/0x134
> [    0.745600]  kernel_init from ret_from_fork+0x14/0x28
> [    0.745727] Exception stack(0x90015fb0 to 0x90015ff8)
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: 83ff59a06663 ("UBI: support ubi_num on mtd.ubi command line")
> Cc: stable at vger.kernel.org
> Signed-off-by: Denis Arefev <arefev at swemel.ru>
> ---
> V1 -> V2: changed the tag Fixes and moved the check to ubi_mtd_param_parse()
>   drivers/mtd/ubi/build.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Zhihao Cheng <chengzhihao1 at huawei.com>
> 
> diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
> index 30be4ed68fad..ef6a22f372f9 100644
> --- a/drivers/mtd/ubi/build.c
> +++ b/drivers/mtd/ubi/build.c
> @@ -1537,7 +1537,7 @@ static int ubi_mtd_param_parse(const char *val, const struct kernel_param *kp)
>   	if (token) {
>   		int err = kstrtoint(token, 10, &p->ubi_num);
>   
> -		if (err) {
> +		if (err || p->ubi_num < UBI_DEV_NUM_AUTO) {
>   			pr_err("UBI error: bad value for ubi_num parameter: %s\n",
>   			       token);
>   			return -EINVAL;
>