From: Theodore Ts'o Date: Sat, 21 Aug 2021 03:44:17 +0000 (-0400) Subject: ext4: fix race writing to an inline_data file while its xattrs are changing X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7067b09fe587cbd47544a3047a40c64e4d636fff;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git ext4: fix race writing to an inline_data file while its xattrs are changing commit a54c4613dac1500b40e4ab55199f7c51f028e848 upstream. The location of the system.data extended attribute can change whenever xattr_sem is not taken. So we need to recalculate the i_inline_off field since it mgiht have changed between ext4_write_begin() and ext4_write_end(). This means that caching i_inline_off is probably not helpful, so in the long run we should probably get rid of it and shrink the in-memory ext4 inode slightly, but let's fix the race the simple way for now. Cc: stable@kernel.org Fixes: f19d5870cbf72 ("ext4: add normal write support for inline data") Reported-by: syzbot+13146364637c7363a7de@syzkaller.appspotmail.com Signed-off-by: Theodore Ts'o Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c index 5bf62bdd84b8..a0f20a048347 100644 --- a/fs/ext4/inline.c +++ b/fs/ext4/inline.c @@ -747,6 +747,12 @@ int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, ext4_write_lock_xattr(inode, &no_expand); BUG_ON(!ext4_has_inline_data(inode)); + /* + * ei->i_inline_off may have changed since ext4_write_begin() + * called ext4_try_to_write_inline_data() + */ + (void) ext4_find_inline_data_nolock(inode); + kaddr = kmap_atomic(page); ext4_write_inline_data(inode, &iloc, kaddr, pos, len); kunmap_atomic(kaddr);