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authorAlexander Potapenko <glider@google.com>2022-11-21 12:21:30 +0100
committerTheodore Ts'o <tytso@mit.edu>2022-12-08 21:49:25 -0500
commit956510c0c7439e90b8103aaeaf4da92878c622f0 (patch)
tree0001e71f9a6919cd5da3e0c2d73c2f4917c20e5f /fs/ext4
parent131294c35ed6f777bd4e79d42af13b5c41bf2775 (diff)
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@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
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/verity.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
index 3c640bd7ecae..30e3b65798b5 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);