Patch "fs: ext4: initialize fsdata in pagecache_write()" has been added to the 5.4-stable tree

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This is a note to let you know that I've just added the patch titled

    fs: ext4: initialize fsdata in pagecache_write()

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     fs-ext4-initialize-fsdata-in-pagecache_write.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 3311e1aa8f8765434003bbf646bd4ddd16c9ead1
Author: Alexander Potapenko <glider@xxxxxxxxxx>
Date:   Mon Nov 21 12:21:30 2022 +0100

    fs: ext4: initialize fsdata in pagecache_write()
    
    [ Upstream commit 956510c0c7439e90b8103aaeaf4da92878c622f0 ]
    
    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@xxxxxxxxxx>
    Fixes: c93d8f885809 ("ext4: add basic fs-verity support")
    Reported-by: syzbot+9767be679ef5016b6082@xxxxxxxxxxxxxxxxxxxxxxxxx
    Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>
    Reviewed-by: Eric Biggers <ebiggers@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20221121112134.407362-1-glider@xxxxxxxxxx
    Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
    Cc: stable@xxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
index 0c67b7060eb4..9879ea046e5a 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 = pagecache_write_begin(NULL, inode->i_mapping, pos, n, 0,



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