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Date: Mon, 21 Nov 2022 19:53:19 +0000 From: Eric Biggers <ebiggers@...nel.org> To: Alexander Potapenko <glider@...gle.com> Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org, tytso@....edu, adilger.kernel@...ger.ca, jaegeuk@...nel.org, chao@...nel.org, linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net Subject: Re: [PATCH 3/5] fs: f2fs: initialize fsdata in pagecache_write() On Mon, Nov 21, 2022 at 12:21:32PM +0100, Alexander Potapenko wrote: > When aops->write_begin() does not initialize fsdata, KMSAN may report > an error passing the latter to aops->write_end(). > > Fix this by unconditionally initializing fsdata. > > Suggested-by: Eric Biggers <ebiggers@...nel.org> > Fixes: 95ae251fe828 ("f2fs: add fs-verity support") > Signed-off-by: Alexander Potapenko <glider@...gle.com> > --- > fs/f2fs/verity.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/f2fs/verity.c b/fs/f2fs/verity.c > index c352fff88a5e6..3f4f3295f1c66 100644 > --- a/fs/f2fs/verity.c > +++ b/fs/f2fs/verity.c > @@ -81,7 +81,7 @@ static int pagecache_write(struct inode *inode, const void *buf, size_t count, > size_t n = min_t(size_t, count, > PAGE_SIZE - offset_in_page(pos)); > struct page *page; > - void *fsdata; > + void *fsdata = NULL; > int res; > > res = aops->write_begin(NULL, mapping, pos, n, &page, &fsdata); Reviewed-by: Eric Biggers <ebiggers@...gle.com> - Eric
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