torvalds/linux
torvalds/linux
2
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-09-04 20:19:47 +08:00
Code

block: Fix bvec_set_folio() for very large folios

Browse Source 
Similarly to 26064d3e2b ("block: fix adding folio to bio"), if
we attempt to add a folio that is larger than 4GB, we'll silently
truncate the offset and len.  Widen the parameters to size_t, assert
that the length is less than 4GB and set the first page that contains
the interesting data rather than the first page of the folio.

Fixes: 26db5ee158 (block: add a bvec_set_folio helper)
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20250612144255.2850278-1-willy@infradead.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Matthew Wilcox (Oracle) 2025-06-12 15:42:53 +01:00 committed by Jens Axboe
parent f826ec7966
commit 5e223e06ee
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/bvec.h
View File

@ -57,9 +57,12 @@ static inline void bvec_set_page(struct bio_vec *bv, struct page *page,
* @offset: offset into the folio
*/
static inline void bvec_set_folio(struct bio_vec *bv, struct folio *folio,
unsigned int len, unsigned int offset)
size_t len, size_t offset)
{
bvec_set_page(bv, &folio->page, len, offset);
unsigned long nr = offset / PAGE_SIZE;
WARN_ON_ONCE(len > UINT_MAX);
bvec_set_page(bv, folio_page(folio, nr), len, offset % PAGE_SIZE);
}
/**