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linux-next/fs/erofs
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Gao Xiang 0bc8061ffc erofs: handle NONHEAD !delta[1] lclusters gracefully 
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
2024-11-18 18:50:14 +08:00
..
compress.h erofs: avoid refcounting short-lived pages 2024-07-11 15:14:26 +08:00
data.c erofs: clarify direct I/O support 2024-11-18 18:50:14 +08:00
decompressor_deflate.c erofs: tidy up stream decompressors 2024-07-09 19:04:41 +08:00
decompressor_lzma.c erofs: convert comma to semicolon 2024-07-26 18:48:12 +08:00
decompressor_zstd.c erofs: tidy up stream decompressors 2024-07-09 19:04:41 +08:00
decompressor.c erofs: fix error handling in z_erofs_init_decompressor 2024-09-10 00:46:34 +08:00
dir.c erofs: simplify readdir operation 2024-08-19 11:06:20 +08:00
erofs_fs.h erofs: restrict pcluster size limitations 2024-09-12 23:00:09 +08:00
fileio.c erofs: support compressed inodes for fileio 2024-09-10 15:27:09 +08:00
fscache.c erofs: don't align offset for erofs_read_metabuf() (simple cases) 2024-05-18 01:47:26 +08:00
inode.c erofs: clarify direct I/O support 2024-11-18 18:50:14 +08:00
internal.h erofs: get rid of buf->kmap_type 2024-11-18 18:50:14 +08:00
Kconfig erofs: mark experimental fscache backend deprecated 2024-09-10 15:27:11 +08:00
Makefile erofs: support unencoded inodes for fileio 2024-09-10 15:26:36 +08:00
namei.c erofs_buf: store address_space instead of inode 2024-04-25 00:57:14 -04:00
super.c erofs: fix blksize < PAGE_SIZE for file-backed mounts 2024-11-18 18:50:14 +08:00
sysfs.c erofs: add sysfs node to drop internal caches 2024-11-18 18:50:13 +08:00
xattr.c erofs_buf: store address_space instead of inode 2024-04-25 00:57:14 -04:00
xattr.h erofs: move erofs_xattr_handlers and xattr_handler_map to .rodata 2023-10-09 16:24:17 +02:00
zdata.c erofs: add sysfs node to drop internal caches 2024-11-18 18:50:13 +08:00
zmap.c erofs: handle NONHEAD !delta[1] lclusters gracefully 2024-11-18 18:50:14 +08:00
zutil.c erofs: move erofs_workgroup operations into zdata.c 2024-11-18 18:50:12 +08:00