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nilfs2: prevent general protection fault in nilfs_clear_dirty_page()

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commit 782e53d0c14420858dbf0f8f797973c150d3b6d7 upstream.

In a syzbot stress test that deliberately causes file system errors on
nilfs2 with a corrupted disk image, it has been reported that
nilfs_clear_dirty_page() called from nilfs_clear_dirty_pages() can cause a
general protection fault.

In nilfs_clear_dirty_pages(), when looking up dirty pages from the page
cache and calling nilfs_clear_dirty_page() for each dirty page/folio
retrieved, the back reference from the argument page to "mapping" may have
been changed to NULL (and possibly others).  It is necessary to check this
after locking the page/folio.

So, fix this issue by not calling nilfs_clear_dirty_page() on a page/folio
after locking it in nilfs_clear_dirty_pages() if the back reference
"mapping" from the page/folio is different from the "mapping" that held
the page/folio just before.

Link: https://lkml.kernel.org/r/20230612021456.3682-1-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Reported-by: syzbot+53369d11851d8f26735c@syzkaller.appspotmail.com
Closes: https://lkml.kernel.org/r/000000000000da4f6b05eb9bf593@google.com
Tested-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ryusuke Konishi 2023-06-12 11:14:56 +09:00 committed by Greg Kroah-Hartman
parent 3845c38417
commit 4de2093674
1 changed files with 9 additions and 1 deletions
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10
fs/nilfs2/page.c
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@ -369,7 +369,15 @@ void nilfs_clear_dirty_pages(struct address_space *mapping, bool silent)
struct page *page = pvec.pages[i];
lock_page(page);
nilfs_clear_dirty_page(page, silent);
/*
* This page may have been removed from the address
* space by truncation or invalidation when the lock
* was acquired. Skip processing in that case.
*/
if (likely(page->mapping == mapping))
nilfs_clear_dirty_page(page, silent);
unlock_page(page);
}
pagevec_release(&pvec);