Messages in this thread Patch in this message | | | From | Vincent Whitchurch <> | Date | Fri, 26 May 2023 15:57:30 +0200 | Subject | [PATCH mm-nonmm-unstable v2 1/2] squashfs: fix page update race |
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We only put the page into the cache after we've read it, so the PageUptodate() check should not be necessary. In fact, it's actively harmful since the check could fail (since we used find_get_page() and not find_lock_page()) and we could end up submitting a page for I/O after it has been read and while it's actively being used, which could lead to corruption depending on what the block driver does with it.
Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> --- fs/squashfs/block.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c index 6285f5afb6c6..f2412e5fc84b 100644 --- a/fs/squashfs/block.c +++ b/fs/squashfs/block.c @@ -92,7 +92,7 @@ static int squashfs_bio_read_cached(struct bio *fullbio, bio_for_each_segment_all(bv, fullbio, iter_all) { struct page *page = bv->bv_page; - if (page->mapping == cache_mapping && PageUptodate(page)) { + if (page->mapping == cache_mapping) { idx++; continue; } -- 2.34.1
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