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btree: catch NULL value before it does harm 

Storing NULL values in the btree is illegal and can lead to memory
corruption and possible other fun as well.  Catch it on insert, instead
of waiting for the inevitable.

Signed-off-by: Joern Engel <joern@logfs.org>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joern Engel 2012-06-07 14:21:14 -07:00 committed by Linus Torvalds
parent cbf8ae32f6
commit 39caa0916e
1 changed files with 1 additions and 0 deletions
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lib/btree.c
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@ -509,6 +509,7 @@ static int btree_insert_level(struct btree_head *head, struct btree_geo *geo,
int btree_insert(struct btree_head *head, struct btree_geo *geo,
unsigned long *key, void *val, gfp_t gfp)
{
BUG_ON(!val);
return btree_insert_level(head, geo, key, val, 1, gfp);
}
EXPORT_SYMBOL_GPL(btree_insert);