linux-ext4 - [Bug 47731] Null pointer dereference at strchr

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Message-Id: <20120920012111.5D7DA11FAE2@bugzilla.kernel.org>
Date:	Thu, 20 Sep 2012 01:21:11 +0000 (UTC)
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 47731] Null pointer dereference at strchr

https://bugzilla.kernel.org/show_bug.cgi?id=47731


Theodore Tso <tytso@....edu> changed:

           What    |Removed                     |Added
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                 CC|                            |tytso@....edu




--- Comment #1 from Theodore Tso <tytso@....edu>  2012-09-20 01:21:10 ---
Is this repeatable?   I'm having a lot of trouble figuring out the stack trace,
since strchr isn't used anywhere in the code path involved with printing the
ext4 mount options while returning the contents of /proc/mounts (which is
obviously what is going on).

The only strchr that looks even vaguely possible is the one used by
seq_escape() in fs/seq_file, which is called by mangle() and which is called by
show_vfsmnt() in fs/namespace.c.   But the stack trace doesn't look consistent
with that, either.   Part of the problem is between the inline functions, and
the function pointers used by show_vfsmnt, the stack dump in the OOPS message
can be quite misleading.

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