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[lts94] Many VULNs 9-10-25 #568

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Merged
merged 2 commits into from
Sep 12, 2025
Merged

[lts94] Many VULNs 9-10-25 #568

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34084cd
ext4: fix double-free of blocks due to wrong extents moved_len
bmastbergen Sep 10, 2025
8d3a034
posix-cpu-timers: fix race between handle_posix_cpu_timers() and posi…
bmastbergen Sep 10, 2025
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6 changes: 2 additions & 4 deletions fs/ext4/move_extent.c
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Original file line number Diff line number Diff line change
Expand Up @@ -621,6 +621,7 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
goto out;
o_end = o_start + len;

*moved_len = 0;
while (o_start < o_end) {
struct ext4_extent *ex;
ext4_lblk_t cur_blk, next_blk;
Expand Down Expand Up @@ -675,7 +676,7 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
*/
ext4_double_up_write_data_sem(orig_inode, donor_inode);
/* Swap original branches with new branches */
move_extent_per_page(o_filp, donor_inode,
*moved_len += move_extent_per_page(o_filp, donor_inode,
orig_page_index, donor_page_index,
offset_in_page, cur_len,
unwritten, &ret);
Expand All @@ -685,9 +686,6 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
o_start += cur_len;
d_start += cur_len;
}
*moved_len = o_start - orig_blk;
if (*moved_len > len)
*moved_len = len;

out:
if (*moved_len) {
Expand Down
9 changes: 9 additions & 0 deletions kernel/time/posix-cpu-timers.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1379,6 +1379,15 @@ void run_posix_cpu_timers(void)

lockdep_assert_irqs_disabled();

/*
* Ensure that release_task(tsk) can't happen while
* handle_posix_cpu_timers() is running. Otherwise, a concurrent
* posix_cpu_timer_del() may fail to lock_task_sighand(tsk) and
* miss timer->it.cpu.firing != 0.
*/
if (tsk->exit_state)
return;

/*
* If the actual expiry is deferred to task work context and the
* work is already scheduled there is no point to do anything here.
Expand Down