On 2018年04月18日 10:09, Shan Hai wrote:
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@xxxxxxxxxx>
This one supposed to be applied on top of below: https://www.spinics.net/lists/linux-xfs/msg17254.html [PATCH] xfs: set format back to extents if xfs_bmap_extents_to_btree fails Thanks Shan Hai
--- fs/xfs/libxfs/xfs_bmap.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 040eeda..90b743d 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -724,19 +724,14 @@ 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. @@ -748,6 +743,10 @@ 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. */ @@ -787,6 +786,15 @@ 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; }/*
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