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3a23787ca8
syzbot reported a null-ptr-deref in fuse_read_args_fill:
fuse_read_folio+0xb0/0x100 fs/fuse/file.c:905
filemap_read_folio+0xc6/0x2a0 mm/filemap.c:2367
do_read_cache_folio+0x263/0x5c0 mm/filemap.c:3825
read_mapping_folio include/linux/pagemap.h:1011 [inline]
erofs_bread+0x34d/0x7e0 fs/erofs/data.c:41
erofs_read_superblock fs/erofs/super.c:281 [inline]
erofs_fc_fill_super+0x2b9/0x2500 fs/erofs/super.c:625
Unlike most filesystems, some network filesystems and FUSE need
unavoidable valid `file` pointers for their read I/Os [1].
Anyway, those use cases need to be supported too.
[1] https://docs.kernel.org/filesystems/vfs.html
Reported-by: syzbot+0b1279812c46e48bb0c1@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/r/6727bbdf.050a0220.3c8d68.0a7e.GAE@google.com
Fixes:
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| arch | ||
| block | ||
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| crypto | ||
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| fs | ||
| include | ||
| init | ||
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| ipc | ||
| kernel | ||
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.