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fs: ext4: initialize fsdata in pagecache_write()
commit956510c0c7
upstream. 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:c93d8f8858
("ext4: add basic fs-verity support") Reported-by: syzbot+9767be679ef5016b6082@syzkaller.appspotmail.com Signed-off-by: Alexander Potapenko <glider@google.com> Reviewed-by: Eric Biggers <ebiggers@google.com> Link: https://lore.kernel.org/r/20221121112134.407362-1-glider@google.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -79,7 +79,7 @@ static int pagecache_write(struct inode *inode, const void *buf, size_t count,
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size_t n = min_t(size_t, count,
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PAGE_SIZE - offset_in_page(pos));
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struct page *page;
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void *fsdata;
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void *fsdata = NULL;
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int res;
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res = aops->write_begin(NULL, mapping, pos, n, &page, &fsdata);
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