mm/filemap.c: remove bogus VM_BUG_ON

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It is not safe to check page->index without holding the page lock.  It
can be changed if the page is moved between the swap cache and the page
cache for a shmem file, for example.  There is a VM_BUG_ON below which
checks page->index is correct after taking the page lock.

Link: https://lkml.kernel.org/r/20210818144932.940640-1-willy@infradead.org
Fixes: 5c211ba29d ("mm: add and use find_lock_entries")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reported-by: <syzbot+c87be4f669d920c76330@syzkaller.appspotmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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Matthew Wilcox (Oracle) 2021-11-05 13:37:10 -07:00 • committed by Linus Torvalds

parent 61d0017e5a

commit d417b49fff

1 changed files with 0 additions and 1 deletions

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mm/filemap.c

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