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Shutemov" , Hugh Dickins , Hannes Reinecke , Keith Busch , linux-mm , linux-block@vger.kernel.org, linux-fsdevel , "linux-kernel@vger.kernel.org" From: Tony Battersby Subject: [PATCH] block: Fix page refcounts for unaligned buffers in __bio_release_pages() X-ASG-Orig-Subj: [PATCH] block: Fix page refcounts for unaligned buffers in __bio_release_pages() X-Barracuda-Connect: UNKNOWN[10.10.4.126] X-Barracuda-Start-Time: 1709230093 X-Barracuda-URL: https://10.10.4.122:443/cgi-mod/mark.cgi X-Barracuda-BRTS-Status: 1 X-Virus-Scanned: by bsmtpd at cybernetics.com X-Barracuda-Scan-Msg-Size: 1347 Fix an incorrect number of pages being released for buffers that do not start at the beginning of a page. Fixes: 1b151e2435fc ("block: Remove special-casing of compound pages") Cc: stable@vger.kernel.org Signed-off-by: Tony Battersby Tested-by: Greg Edwards --- Tested with 6.1.79. The 6.1 backport can just use folio_put_refs(fi.folio, nr_pages) instead of do {...} while. block/bio.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) base-commit: d206a76d7d2726f3b096037f2079ce0bd3ba329b diff --git a/block/bio.c b/block/bio.c index b9642a41f286..b52b56067e79 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1152,7 +1152,7 @@ void __bio_release_pages(struct bio *bio, bool mark_dirty) bio_for_each_folio_all(fi, bio) { struct page *page; - size_t done = 0; + size_t nr_pages; if (mark_dirty) { folio_lock(fi.folio); @@ -1160,10 +1160,11 @@ void __bio_release_pages(struct bio *bio, bool mark_dirty) folio_unlock(fi.folio); } page = folio_page(fi.folio, fi.offset / PAGE_SIZE); + nr_pages = (fi.offset + fi.length - 1) / PAGE_SIZE - + fi.offset / PAGE_SIZE + 1; do { bio_release_page(bio, page++); - done += PAGE_SIZE; - } while (done < fi.length); + } while (--nr_pages != 0); } } EXPORT_SYMBOL_GPL(__bio_release_pages);