Btrfs: ulist realloc bugfix

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ulist_next gets the pointer to the previously returned element to find the
next element from there. However, when we call ulist_add while iteration
with ulist_next is in progress (ulist explicitly supports this), we can
realloc the ulist internal memory, which makes the pointer to the previous
element useless.

Instead, we now use an iterator parameter that's independent from the
internal pointers.

Reported-by: Alexander Block <ablock84@googlemail.com>
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>

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This commit is contained in:

Jan Schmidt 2012-05-22 14:56:50 +02:00

parent b9fab919b7

commit cd1b413c5c

3 changed files with 29 additions and 21 deletions

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18

fs/btrfs/backref.c

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23

fs/btrfs/ulist.c

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9

fs/btrfs/ulist.h

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