From 49652e1bbd0a2da40de02dd06bbb865fdd70fa4e Mon Sep 17 00:00:00 2001 From: Tudor Ambarus Date: Wed, 19 Apr 2023 06:46:08 +0000 Subject: [PATCH] UPSTREAM: Revert "ext4: fix use-after-free in ext4_xattr_set_entry" This reverts commit bb8592efcf8ef2f62947745d3182ea05b5256a15 which is commit 67d7d8ad99beccd9fe92d585b87f1760dc9018e3 upstream. The order in which patches are queued to stable matters. This patch has a logical dependency on commit 310c097c2bdbea253d6ee4e064f3e65580ef93ac upstream, and failing to queue the latter results in a null-ptr-deref reported at the Link below. In order to avoid conflicts on stable, revert the commit just so that we can queue its prerequisite patch first and then queue the same after. Link: https://syzkaller.appspot.com/bug?extid=d5ebf56f3b1268136afd Signed-off-by: Tudor Ambarus Signed-off-by: Greg Kroah-Hartman Bug: 253759004 Change-Id: I0e09ac2e68c2b21834ccd620c79f73fadc420170 (cherry picked from commit 9400206d9d5eebc0317da4151364ade32d28944f) Signed-off-by: Tudor Ambarus --- fs/ext4/xattr.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index b80ad5a7b05c..3c570ea4d0a6 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -2182,9 +2182,8 @@ int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, struct ext4_inode *raw_inode; int error; - if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) + if (EXT4_I(inode)->i_extra_isize == 0) return 0; - raw_inode = ext4_raw_inode(&is->iloc); header = IHDR(inode, raw_inode); is->s.base = is->s.first = IFIRST(header); @@ -2212,9 +2211,8 @@ int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, struct ext4_xattr_search *s = &is->s; int error; - if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) + if (EXT4_I(inode)->i_extra_isize == 0) return -ENOSPC; - error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); if (error) return error;