linux-ext4 - Re: [PATCH] e2fsprogs: avoid segfault when s_nr

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Date:   Tue, 2 Oct 2018 21:54:43 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Lukas Czerner <lczerner@...hat.com>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH] e2fsprogs: avoid segfault when s_nr_users is too high

On Tue, Aug 14, 2018 at 04:37:53PM +0200, Lukas Czerner wrote:
> Currently in e2fsprogs tools it's possible to access out of bounds
> memory when reading list of ids sharing a journal log
> (journal_superblock_t->s_users[]) in case where s_nr_users is too high.
> 
> This is because we never check whether the s_nr_users fits into the
> restriction of JFS_USERS_MAX. Fix it by checking that nr_users is not
> bigger than JFS_USERS_MAX and error out when possiblem.
> 
> Also add test for dumpe2fs. The rest would require involving external
> journal which is not possible to test with e2fsprogs test suite at the
> moment.
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>

Thanks, applied.

					- Ted