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Date: Mon, 21 Nov 2022 12:21:30 +0100 From: Alexander Potapenko <glider@...gle.com> To: 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, Eric Biggers <ebiggers@...nel.org>, syzbot+9767be679ef5016b6082@...kaller.appspotmail.com Subject: [PATCH 1/5] fs: ext4: initialize fsdata in pagecache_write() When aops->write_begin() does not initialize fsdata, KMSAN reports an error passing the latter to aops->write_end(). Fix this by unconditionally initializing fsdata. Cc: Eric Biggers <ebiggers@...nel.org> Fixes: c93d8f885809 ("ext4: add basic fs-verity support") Reported-by: syzbot+9767be679ef5016b6082@...kaller.appspotmail.com Signed-off-by: Alexander Potapenko <glider@...gle.com> --- fs/ext4/verity.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c index 3c640bd7ecaeb..30e3b65798b50 100644 --- a/fs/ext4/verity.c +++ b/fs/ext4/verity.c @@ -79,7 +79,7 @@ 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); -- 2.38.1.584.g0f3c55d4c2-goog
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