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linux/fs/erofs
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Gao Xiang f466641deb erofs: handle NONHEAD !delta[1] lclusters gracefully 
[ Upstream commit 0bc8061ffc ]

syzbot reported a WARNING in iomap_iter_done:
 iomap_fiemap+0x73b/0x9b0 fs/iomap/fiemap.c:80
 ioctl_fiemap fs/ioctl.c:220 [inline]

Generally, NONHEAD lclusters won't have delta[1]==0, except for crafted
images and filesystems created by pre-1.0 mkfs versions.

Previously, it would immediately bail out if delta[1]==0, which led to
inadequate decompressed lengths (thus FIEMAP is impacted).  Treat it as
delta[1]=1 to work around these legacy mkfs versions.

`lclusterbits > 14` is illegal for compact indexes, error out too.

Reported-by: syzbot+6c0b301317aa0156f9eb@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/r/67373c0c.050a0220.2a2fcc.0079.GAE@google.com
Tested-by: syzbot+6c0b301317aa0156f9eb@syzkaller.appspotmail.com
Fixes: d95ae5e253 ("erofs: add support for the full decompressed length")
Fixes: 001b8ccd06 ("erofs: fix compact 4B support for 16k block size")
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20241115173651.3339514-1-hsiangkao@linux.alibaba.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-12-09 10:32:11 +01:00
..
compress.h erofs: simplify compression configuration parser 2024-01-25 15:35:57 -08:00
data.c erofs: fix NULL dereference of dif->bdev_handle in fscache mode 2024-07-05 09:34:05 +02:00
decompressor.c erofs: avoid debugging output for (de)compressed data 2024-08-19 06:04:26 +02:00
decompressor_deflate.c erofs: avoid allocating DEFLATE streams before mounting 2024-06-16 13:47:31 +02:00
decompressor_lzma.c erofs: simplify compression configuration parser 2024-01-25 15:35:57 -08:00
dir.c erofs: keep meta inode into erofs_buf 2023-04-17 01:15:50 +08:00
erofs_fs.h erofs: update on-disk format for xattr name filter 2023-08-11 12:11:44 +08:00
fscache.c erofs: fix lockdep false positives on initializing erofs_pseudo_mnt 2024-03-26 18:19:40 -04:00
inode.c erofs: fix incorrect symlink detection in fast symlink 2024-10-04 16:29:00 +02:00
internal.h erofs: get rid of erofs_fs_context 2024-05-25 16:22:53 +02:00
Kconfig erofs: boost negative xattr lookup with bloom filter 2023-08-11 12:11:44 +08:00
Makefile erofs: DEFLATE compression support 2023-08-11 12:11:17 +08:00
namei.c erofs: fix refcount on the metabuf used for inode lookup 2024-03-01 13:35:01 +01:00
pcpubuf.c erofs: mark z_erofs_lzma_init/erofs_pcpubuf_init w/ __init 2023-03-09 22:49:30 +08:00
super.c erofs: reliably distinguish block based and fscache mode 2024-05-25 16:22:53 +02:00
sysfs.c erofs: make kobj_type structures constant 2023-02-15 08:11:26 +08:00
utils.c erofs: fix erofs_insert_workgroup() lockref usage 2023-11-20 11:59:23 +01:00
xattr.c erofs: boost negative xattr lookup with bloom filter 2023-08-11 12:11:44 +08:00
xattr.h Changes since last update: 2023-04-24 14:25:39 -07:00
zdata.c erofs: fix ztailpacking for subpage compressed blocks 2024-02-05 20:14:16 +00:00
zmap.c erofs: handle NONHEAD !delta[1] lclusters gracefully 2024-12-09 10:32:11 +01:00