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| author | Alexander Potapenko <glider@google.com> | 2022-11-21 12:21:30 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-12 11:59:00 +0100 |
| commit | 970bfd7a4188dc1e6cdb82bad0690f12ffb5c79b (patch) | |
| tree | 9f9a71386a7f3855d3ea7c808fcc9af37721aad2 /fs | |
| parent | 744bbde378a53b90287bb7111daaa46a2c849e88 (diff) | |
| download | linux-stable-970bfd7a4188dc1e6cdb82bad0690f12ffb5c79b.tar.gz linux-stable-970bfd7a4188dc1e6cdb82bad0690f12ffb5c79b.tar.bz2 linux-stable-970bfd7a4188dc1e6cdb82bad0690f12ffb5c79b.zip | |
fs: ext4: initialize fsdata in pagecache_write()
commit 956510c0c7439e90b8103aaeaf4da92878c622f0 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: c93d8f885809 ("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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/verity.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c index 840639e7a7ca..5ece4d3c6210 100644 --- a/fs/ext4/verity.c +++ b/fs/ext4/verity.c @@ -76,7 +76,7 @@ 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 = pagecache_write_begin(NULL, inode->i_mapping, pos, n, 0, |