hfsplus: fix oops on mount with corrupted btree extent records

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A particular fsfuzzer run caused an hfs file system to crash on mount. This
is due to a corrupted MDB extent record causing a miscalculation of
HFSPLUS_I(inode)->first_blocks for the extent tree. If the extent records
are zereod out, then it won't trigger the first_blocks special case and
instead falls through to the extent code, which we're in the middle
of initializing.

This patch catches the 0 size extent records, reports the corruption,
and fails the mount.

[hch: ported of commit 47f365eb57 from hfs]

Reported-by: Ramon de Carvalho Valle <rcvalle@linux.vnet.ibm.com>
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Christoph Hellwig <hch@tuxera.com>

...

This commit is contained in:

Jeff Mahoney 2010-10-14 09:53:37 -04:00 • committed by Christoph Hellwig

parent 40de9a7ceb

commit ee52716245

1 changed files with 9 additions and 2 deletions

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fs/hfsplus/btree.c

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