Description
In the Linux kernel, the following vulnerability has been resolved: atm: fore200e: fix use-after-free in tasklets during device removal When the PCA-200E or SBA-200E adapter is being detached, the fore200e is deallocated. However, the tx_tasklet or rx_tasklet may still be running or pending, leading to use-after-free bug when the already freed fore200e is accessed again in fore200e_tx_tasklet() or fore200e_rx_tasklet(). One of the race conditions can occur as follows: CPU 0 (cleanup) | CPU 1 (tasklet) fore200e_pca_remove_one() | fore200e_interrupt() fore200e_shutdown() | tasklet_schedule() kfree(fore200e) | fore200e_tx_tasklet() | fore200e-> // UAF Fix this by ensuring tx_tasklet or rx_tasklet is properly canceled before the fore200e is released. Add tasklet_kill() in fore200e_shutdown() to synchronize with any pending or running tasklets. Moreover, since fore200e_reset() could prevent further interrupts or data transfers, the tasklet_kill() should be placed after fore200e_reset() to prevent the tasklet from being rescheduled in fore200e_interrupt(). Finally, it only needs to do tasklet_kill() when the fore200e state is greater than or equal to FORE200E_STATE_IRQ, since tasklets are uninitialized in earlier states. In a word, the tasklet_kill() should be placed in the FORE200E_STATE_IRQ branch within the switch...case structure. This bug was identified through static analysis.
Product status
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 91f25749aaf57c47ae1e12478144e6ea8c8562f2
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 73fbc5d1a9ccb626937500bbd67136f077d8237b
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before aba0b4bc09376dfc3d53c826514fe38fc8337f52
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before e075ec9b08f862dade8011481058f7eb5f716c57
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 97900f512252a59f23d6ce4ab215cc88fed66e68
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before e4ff4e3ffcf9d5aad380cdd1d8cdc008bb34f97d
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 5189368f10903956be05062d160b2804bf5e5016
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 8930878101cd40063888a68af73b1b0f8b6c79bc
2.6.12
Any version before 2.6.12
5.10.252 (semver)
5.15.202 (semver)
6.1.165 (semver)
6.6.128 (semver)
6.12.75 (semver)
6.18.16 (semver)
6.19.6 (semver)
7.0 (original_commit_for_fix)
References
git.kernel.org/...c/91f25749aaf57c47ae1e12478144e6ea8c8562f2
git.kernel.org/...c/73fbc5d1a9ccb626937500bbd67136f077d8237b
git.kernel.org/...c/aba0b4bc09376dfc3d53c826514fe38fc8337f52
git.kernel.org/...c/e075ec9b08f862dade8011481058f7eb5f716c57
git.kernel.org/...c/97900f512252a59f23d6ce4ab215cc88fed66e68
git.kernel.org/...c/e4ff4e3ffcf9d5aad380cdd1d8cdc008bb34f97d
git.kernel.org/...c/5189368f10903956be05062d160b2804bf5e5016
git.kernel.org/...c/8930878101cd40063888a68af73b1b0f8b6c79bc