On 6/20/23 10:08, Richard W.M. Jones wrote:
> On Tue, Jun 20, 2023 at 05:00:24PM +0900, Vincent Mailhol wrote:
>> If /sys/block can not be opened, get_devices() returns NULL.
>>
>> cmdline() does not check this result and below code snippet:
>>
>> scanned = get_devices();
>> devices = (gchar **) scanned->data;
>>
>> results in a segmentation fault.
>>
>> Add a check on scanned.
>>
>> Relevant logs:
>>
>> Unable to open /sys/block: No such file or directory
>> [ 0.777352] ldmtool[164]: segfault at 0 ip 0000563a225cd6a5 sp
>> 00007ffe54965a60 error 4 in ldmtool[563a225cb000+3000]
>> [ 0.778278] Code: 18 64 48 33 1c 25 28 00 00 00 75 5e 48 83 c4 28 5b 5d
>> 41 5c 41 5d 41 5e 41 5f c3 66 2e 0f 1f 84 00 00 00 00 00 e8 db fd ff ff <4c>
>> 8b 20 48 89 44 24 08 4c 89 e7 e8 0b e1 ff ff 45 31 c0 4c 89 e1
>>
>> Fixes: 25d9635e4ee5 ("Add ldmtool")
>> Signed-off-by: Vincent Mailhol <[email protected]>
>> ---
>>
>> * Changelog *
>>
>> v2 -> v3
>>
>> * Fix the From: tag (incorrect e-mail address, sorry for the noise).
>>
>> v1 -> v2
>>
>> * Directly return FALSE instead of goto error. Jumping to the error
>> label bypasses jb's declaration thus resulting in an undefined
>> behavior.
>>
>> ---
>> src/ldmtool.c | 2 ++
>> 1 file changed, 2 insertions(+)
>>
>> diff --git a/src/ldmtool.c b/src/ldmtool.c
>> index 6957c1a..dbe2c8c 100644
>> --- a/src/ldmtool.c
>> +++ b/src/ldmtool.c
>> @@ -746,6 +746,8 @@ cmdline(LDM * const ldm, gchar **devices,
>> GArray * scanned = NULL;
>> if (!devices) {
>> scanned = get_devices();
>> + if (!scanned)
>> + return FALSE;
>> devices = (gchar **) scanned->data;
>> }
>
> Seems fine, based on Laszlo's analysis of the first version, thus:
>
> Acked-by: Richard W.M. Jones <[email protected]>
>
> I believe I will be able to push this patch (or if not, I'll ask Matt
> to do it later). Is this version OK Laszlo?
Reviewed-by: Laszlo Ersek <[email protected]>
Thanks!
Laszlo
>
> Rich.
>
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