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Changes for 5.8-rc4:

Browse Source 
- Fix a use-after-free bug when the fs shuts down.
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Merge tag 'xfs-5.8-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull xfs fix from Darrick Wong:
 "Fix a use-after-free bug when the fs shuts down"

* tag 'xfs-5.8-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: fix use-after-free on CIL context on shutdown
This commit is contained in:
Linus Torvalds 2020-07-03 14:46:46 -07:00
commit 0c7d7d1fad
2 changed files with 6 additions and 6 deletions
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10
fs/xfs/xfs_log_cil.c
View File

@ -671,7 +671,8 @@ xlog_cil_push_work(
/*
* Wake up any background push waiters now this context is being pushed.
*/
wake_up_all(&ctx->push_wait);
if (ctx->space_used >= XLOG_CIL_BLOCKING_SPACE_LIMIT(log))
wake_up_all(&cil->xc_push_wait);
/*
* Check if we've anything to push. If there is nothing, then we don't
@ -743,13 +744,12 @@ xlog_cil_push_work(
/*
* initialise the new context and attach it to the CIL. Then attach
* the current context to the CIL committing lsit so it can be found
* the current context to the CIL committing list so it can be found
* during log forces to extract the commit lsn of the sequence that
* needs to be forced.
*/
INIT_LIST_HEAD(&new_ctx->committing);
INIT_LIST_HEAD(&new_ctx->busy_extents);
init_waitqueue_head(&new_ctx->push_wait);
new_ctx->sequence = ctx->sequence + 1;
new_ctx->cil = cil;
cil->xc_ctx = new_ctx;
@ -937,7 +937,7 @@ xlog_cil_push_background(
if (cil->xc_ctx->space_used >= XLOG_CIL_BLOCKING_SPACE_LIMIT(log)) {
trace_xfs_log_cil_wait(log, cil->xc_ctx->ticket);
ASSERT(cil->xc_ctx->space_used < log->l_logsize);
xlog_wait(&cil->xc_ctx->push_wait, &cil->xc_push_lock);
xlog_wait(&cil->xc_push_wait, &cil->xc_push_lock);
return;
}
@ -1216,12 +1216,12 @@ xlog_cil_init(
INIT_LIST_HEAD(&cil->xc_committing);
spin_lock_init(&cil->xc_cil_lock);
spin_lock_init(&cil->xc_push_lock);
init_waitqueue_head(&cil->xc_push_wait);
init_rwsem(&cil->xc_ctx_lock);
init_waitqueue_head(&cil->xc_commit_wait);
INIT_LIST_HEAD(&ctx->committing);
INIT_LIST_HEAD(&ctx->busy_extents);
init_waitqueue_head(&ctx->push_wait);
ctx->sequence = 1;
ctx->cil = cil;
cil->xc_ctx = ctx;

2
fs/xfs/xfs_log_priv.h
View File

@ -240,7 +240,6 @@ struct xfs_cil_ctx {
struct xfs_log_vec *lv_chain; /* logvecs being pushed */
struct list_head iclog_entry;
struct list_head committing; /* ctx committing list */
wait_queue_head_t push_wait; /* background push throttle */
struct work_struct discard_endio_work;
};
@ -274,6 +273,7 @@ struct xfs_cil {
wait_queue_head_t xc_commit_wait;
xfs_lsn_t xc_current_sequence;
struct work_struct xc_push_work;
wait_queue_head_t xc_push_wait; /* background push throttle */
} ____cacheline_aligned_in_smp;
/*