Jason reported that a corrupted filesystem failed to replay
the log with a metadata block out of bounds warning:
XFS (dm-2): _xfs_buf_find: Block out of range: block 0x80270fff8, EOFS 0x9c40000
_xfs_buf_find() and xfs_btree_get_bufs() return NULL if
that happens, and then when xfs_alloc_fix_freelist() calls
xfs_trans_binval() on that NULL bp, we oops with:
BUG: unable to handle kernel NULL pointer dereference at 00000000000000f8
We don't handle _xfs_buf_find errors very well, every
caller higher up the stack gets to guess at why it failed.
But we should at least handle it somehow. I chose EIO here
for lack of a better idea. :)
Reported-by: Jason L Tibbitts III <tibbs@xxxxxxxxxxx>
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---
diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index effb64c..d125135 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -1640,6 +1640,10 @@ STATIC int xfs_alloc_ag_vextent_small(xfs_alloc_arg_t *,
bp = xfs_btree_get_bufs(args->mp, args->tp,
args->agno, fbno, 0);
+ if (!bp) {
+ error = -EIO;
+ goto error0;
+ }
xfs_trans_binval(args->tp, bp);
}
args->len = 1;
@@ -2185,6 +2189,10 @@ STATIC int xfs_alloc_ag_vextent_small(xfs_alloc_arg_t *,
if (error)
goto out_agbp_relse;
bp = xfs_btree_get_bufs(mp, tp, args->agno, bno, 0);
+ if (!bp) {
+ error = -EIO;
+ goto out_agbp_relse;
+ }
xfs_trans_binval(tp, bp);
}
--
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