Re: [PATCH net] Fix a potential infinite loop in extract_user_to_sg()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Jakub Kicinski <kuba@xxxxxxxxxx> wrote:

> On Thu, 25 Apr 2024 09:39:32 +0100 David Howells wrote:
> > Fix extract_user_to_sg() so that it will break out of the loop if
> > iov_iter_extract_pages() returns 0 rather than looping around forever.
> 
> Is "goto fail" the right way to break out here?
> My intuition would be "break".
> 
> On a quick read it seems like res = 0 may occur if we run out of
> iterator, is passing maxsize > iter->count illegal?

I would say that you're not allowed to ask for more than is in the iterator.
In a number of places this is called, it's a clear failure if you can't get
that the requested amount out of it - for example, if we're building a cifs
message and have set all the fields in the header and are trying to encrypt
the message.

David





[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [NTFS 3]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [NTFS 3]     [Samba]     [Device Mapper]     [CEPH Development]

  Powered by Linux