In the Linux kernel, the following vulnerability has been resolved:

ext4: fix i_data_sem unlock order in ext4_ind_migrate()

Fuzzing reports a possible deadlock in jbd2_log_wait_commit.

This issue is triggered when an EXT4_IOC_MIGRATE ioctl is set to require
synchronous updates because the file descriptor is opened with O_SYNC.
This can lead to the jbd2_journal_stop() function calling
jbd2_might_wait_for_commit(), potentially causing a deadlock if the
EXT4_IOC_MIGRATE call races with a write(2) system call.

This problem only arises when CONFIG_PROVE_LOCKING is enabled. In this
case, the jbd2_might_wait_for_commit macro locks jbd2_handle in the
jbd2_journal_stop function while i_data_sem is locked. This triggers
lockdep because the jbd2_journal_start function might also lock the same
jbd2_handle simultaneously.

Found by Linux Verification Center (linuxtesting.org) with syzkaller.

Rule: add

kernel.org https://git.kernel.org/stable/c/53b1999cfd2c7addf2e581a32865fe8835467b44 [No types assigned]

kernel.org https://git.kernel.org/stable/c/6252cb6bde7fc76cb8dcb49d1def7c326b190820 [No types assigned]

kernel.org https://git.kernel.org/stable/c/9fedf51ab8cf7b69bff08f37fe0989fec7f5d870 [No types assigned]

kernel.org https://git.kernel.org/stable/c/cc749e61c011c255d81b192a822db650c68b313f [No types assigned]

kernel.org https://git.kernel.org/stable/c/d43776b907659affef1de888525847d64b244194 [No types assigned]

kernel.org https://git.kernel.org/stable/c/d58a00e981d3118b91d503da263e640b7cde6729 [No types assigned]

kernel.org https://git.kernel.org/stable/c/ef05572da0c0eb89614ed01cc17d3c882bdbd1ff [No types assigned]