linux-kernel - Re: [PATCH v2 4/4] kexec_file: Fix the issue of mismatch between loop variable types

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Message-ID: <0C92443D3E2100AF+c669d240-1ee8-4897-a30d-3efefe161085@uniontech.com>
Date: Wed, 5 Nov 2025 11:47:44 +0800
From: Qiang Ma <maqianga@...ontech.com>
To: Baoquan He <bhe@...hat.com>
Cc: akpm@...ux-foundation.org, kexec@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] kexec_file: Fix the issue of mismatch between loop
 variable types


在 2025/11/5 11:05, Baoquan He 写道:
> On 11/03/25 at 02:34pm, Qiang Ma wrote:
>> The type of the struct kimage member variable nr_segments is unsigned long.
>> Correct the loop variable i and the print format specifier type.
> I can't see what's meaningful with this change. nr_segments is unsigned
> long, but it's the range 'i' will loop. If so, we need change all for
> loop of the int iterator.
If image->nr_segments is large enough, 'i' overflow causes an infinite loop.
>> Signed-off-by: Qiang Ma <maqianga@...ontech.com>
>> ---
>>   kernel/kexec_file.c | 5 +++--
>>   1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
>> index 4a24aadbad02..7afdaa0efc50 100644
>> --- a/kernel/kexec_file.c
>> +++ b/kernel/kexec_file.c
>> @@ -366,7 +366,8 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
>>   	int image_type = (flags & KEXEC_FILE_ON_CRASH) ?
>>   			 KEXEC_TYPE_CRASH : KEXEC_TYPE_DEFAULT;
>>   	struct kimage **dest_image, *image;
>> -	int ret = 0, i;
>> +	int ret = 0;
>> +	unsigned long i;
>>   
>>   	/* We only trust the superuser with rebooting the system. */
>>   	if (!kexec_load_permitted(image_type))
>> @@ -432,7 +433,7 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
>>   		struct kexec_segment *ksegment;
>>   
>>   		ksegment = &image->segment[i];
>> -		kexec_dprintk("segment[%d]: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
>> +		kexec_dprintk("segment[%lu]: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
>>   			      i, ksegment->buf, ksegment->bufsz, ksegment->mem,
>>   			      ksegment->memsz);
>>   
>> -- 
>> 2.20.1
>>
>