Messages in this thread Patch in this message | | | Date | Mon, 21 Nov 2022 12:21:30 +0100 | Subject | [PATCH 1/5] fs: ext4: initialize fsdata in pagecache_write() | From | Alexander Potapenko <> |
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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@kernel.org> Fixes: c93d8f885809 ("ext4: add basic fs-verity support") Reported-by: syzbot+9767be679ef5016b6082@syzkaller.appspotmail.com Signed-off-by: Alexander Potapenko <glider@google.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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