Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix inode use after free in ext4_end_io_rsv_work() In ext4_io_end_defer_completion(), check if io_end->list_vec is empty to avoid adding an io_end that requires no conversion to the i_rsv_conversion_list, which in turn prevents starting an unnecessary worker. An ext4_emergency_state() check is also added to avoid attempting to abort the journal in an emergency state. Additionally, ext4_put_io_end_defer() is refactored to call ext4_io_end_defer_completion() directly instead of being open-coded. This also prevents starting an unnecessary worker when EXT4_IO_END_FAILED is set but data_err=abort is not enabled. This ensures that the check in ext4_put_io_end_defer() is consistent with the check in ext4_end_bio(). Otherwise, we might add an io_end to the i_rsv_conversion_list and then call ext4_finish_bio(), after which the inode could be freed before ext4_end_io_rsv_work() is called, triggering a use-after-free issue.
Product status
ce51afb8cc5e1867ea0dfdf5e92ddbe31a1fad5d before ac999862b98a0f49e858e509f776be51406f1e77
ce51afb8cc5e1867ea0dfdf5e92ddbe31a1fad5d before 469c44e66e2110054949609dde095788320139d0
ce51afb8cc5e1867ea0dfdf5e92ddbe31a1fad5d before c678bdc998754589cea2e6afab9401d7d8312ac4
6.15
Any version before 6.15
6.15.10
6.16.1
6.17
References
git.kernel.org/...c/ac999862b98a0f49e858e509f776be51406f1e77
git.kernel.org/...c/469c44e66e2110054949609dde095788320139d0
git.kernel.org/...c/c678bdc998754589cea2e6afab9401d7d8312ac4
