Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 001/149] xfs: dont call xfs_da_shrink_inode with NULL bp | Date | Thu, 20 Aug 2020 11:21:18 +0200 |
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From: Eric Sandeen <sandeen@sandeen.net>
[ Upstream commit bb3d48dcf86a97dc25fe9fc2c11938e19cb4399a ]
xfs_attr3_leaf_create may have errored out before instantiating a buffer, for example if the blkno is out of range. In that case there is no work to do to remove it, and in fact xfs_da_shrink_inode will lead to an oops if we try.
This also seems to fix a flaw where the original error from xfs_attr3_leaf_create gets overwritten in the cleanup case, and it removes a pointless assignment to bp which isn't used after this.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=199969 Reported-by: Xu, Wen <wen.xu@gatech.edu> Tested-by: Xu, Wen <wen.xu@gatech.edu> Signed-off-by: Eric Sandeen <sandeen@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/xfs/libxfs/xfs_attr_leaf.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c index 01a5ecfedfcf1..445a3f2f871fb 100644 --- a/fs/xfs/libxfs/xfs_attr_leaf.c +++ b/fs/xfs/libxfs/xfs_attr_leaf.c @@ -779,9 +779,8 @@ xfs_attr_shortform_to_leaf(xfs_da_args_t *args) ASSERT(blkno == 0); error = xfs_attr3_leaf_create(args, blkno, &bp); if (error) { - error = xfs_da_shrink_inode(args, 0, bp); - bp = NULL; - if (error) + /* xfs_attr3_leaf_create may not have instantiated a block */ + if (bp && (xfs_da_shrink_inode(args, 0, bp) != 0)) goto out; xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */ memcpy(ifp->if_u1.if_data, tmpbuffer, size); /* it back */ -- 2.25.1
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