CVE-2025-38337

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> jbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata()<br /> <br /> Since handle-&gt;h_transaction may be a NULL pointer, so we should change it<br /> to call is_handle_aborted(handle) first before dereferencing it.<br /> <br /> And the following data-race was reported in my fuzzer:<br /> <br /> ==================================================================<br /> BUG: KCSAN: data-race in jbd2_journal_dirty_metadata / jbd2_journal_dirty_metadata<br /> <br /> write to 0xffff888011024104 of 4 bytes by task 10881 on cpu 1:<br /> jbd2_journal_dirty_metadata+0x2a5/0x770 fs/jbd2/transaction.c:1556<br /> __ext4_handle_dirty_metadata+0xe7/0x4b0 fs/ext4/ext4_jbd2.c:358<br /> ext4_do_update_inode fs/ext4/inode.c:5220 [inline]<br /> ext4_mark_iloc_dirty+0x32c/0xd50 fs/ext4/inode.c:5869<br /> __ext4_mark_inode_dirty+0xe1/0x450 fs/ext4/inode.c:6074<br /> ext4_dirty_inode+0x98/0xc0 fs/ext4/inode.c:6103<br /> ....<br /> <br /> read to 0xffff888011024104 of 4 bytes by task 10880 on cpu 0:<br /> jbd2_journal_dirty_metadata+0xf2/0x770 fs/jbd2/transaction.c:1512<br /> __ext4_handle_dirty_metadata+0xe7/0x4b0 fs/ext4/ext4_jbd2.c:358<br /> ext4_do_update_inode fs/ext4/inode.c:5220 [inline]<br /> ext4_mark_iloc_dirty+0x32c/0xd50 fs/ext4/inode.c:5869<br /> __ext4_mark_inode_dirty+0xe1/0x450 fs/ext4/inode.c:6074<br /> ext4_dirty_inode+0x98/0xc0 fs/ext4/inode.c:6103<br /> ....<br /> <br /> value changed: 0x00000000 -&gt; 0x00000001<br /> ==================================================================<br /> <br /> This issue is caused by missing data-race annotation for jh-&gt;b_modified.<br /> Therefore, the missing annotation needs to be added.