diff options
| author | Shan Hai <shan.hai@oracle.com> | 2018-08-10 17:55:55 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2018-08-12 08:37:31 -0700 |
| commit | 01239d77b9dd978863d1a75f0d095ab942a1fe66 (patch) | |
| tree | 886481f2e5c89103b06d6827486d9351b0051dfa /fs/xfs | |
| parent | fa6c668d807b1e9ac041101dfcb59bd8e279cfe5 (diff) | |
| download | linux-01239d77b9dd978863d1a75f0d095ab942a1fe66.tar.bz2 | |
xfs: fix a null pointer dereference in xfs_bmap_extents_to_btree
Fuzzing tool reports a write to null pointer error in the
xfs_bmap_extents_to_btree, fix it by bailing out on encountering
a null pointer.
Signed-off-by: Shan Hai <shan.hai@oracle.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/xfs')
| -rw-r--r-- | fs/xfs/libxfs/xfs_bmap.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 5648a177e0ac..2760314fdf7f 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -712,19 +712,14 @@ xfs_bmap_extents_to_btree( args.wasdel = wasdel; *logflagsp = 0; if ((error = xfs_alloc_vextent(&args))) { - xfs_iroot_realloc(ip, -1, whichfork); ASSERT(ifp->if_broot == NULL); - XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS); - xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); - return error; + goto err1; } if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) { - xfs_iroot_realloc(ip, -1, whichfork); ASSERT(ifp->if_broot == NULL); - XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS); - xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); - return -ENOSPC; + error = -ENOSPC; + goto err1; } /* * Allocation can't fail, the space was reserved. @@ -736,6 +731,10 @@ xfs_bmap_extents_to_btree( ip->i_d.di_nblocks++; xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L); abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0); + if (!abp) { + error = -ENOSPC; + goto err2; + } /* * Fill in the child block. */ @@ -775,6 +774,15 @@ xfs_bmap_extents_to_btree( *curp = cur; *logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork); return 0; + +err2: + xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L); +err1: + xfs_iroot_realloc(ip, -1, whichfork); + XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS); + xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); + + return error; } /* |