ocfs2: fix NULL pointer dereferrence in __ocfs2_change_file_space
 

BugLink: http://bugs.launchpad.net/bugs/1006012

== SRU Justification ==

A NULL pointer will be triggered by ocfs2_fallocate() as it will
invoke __ocfs2_change_file_space() with a NULL as the file argument.
This may result in filesystem corruption.

== Fix ==

This patch has already been submitted upstreams and has been added to
the -mm tree (https://lkml.org/lkml/2012/6/20/686). The fix is a
simple NULL check in the __ocfs2_change_file_space() function.

== Impact ==

Possible filesystem corruption when using fallocate operation.

== Test Case ==

After setting up an ocfs2 node, mount a filesystem and simply execute:

$ fallocate -l 1600m /mnt/test

Luis Henriques (1):
ocfs2: Fix NULL pointer dereferrence in __ocfs2_change_file_space

fs/ocfs2/file.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--
1.7.9.5


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