From c230a4a85bcdbfc1a7415deec6caf04e8fca1301 Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Wed, 4 May 2022 11:45:11 +1000 Subject: [PATCH] xfs: fix potential log item leak Ever since we added shadown format buffers to the log items, log items need to handle the item being released with shadow buffers attached. Due to the fact this requirement was added at the same time we added new rmap/reflink intents, we missed the cleanup of those items. In theory, this means shadow buffers can be leaked in a very small window when a shutdown is initiated. Testing with KASAN shows this leak does not happen in practice - we haven't identified a single leak in several years of shutdown testing since ~v4.8 kernels. However, the intent whiteout cleanup mechanism results in every cancelled intent in exactly the same state as this tiny race window creates and so if intents down clean up shadow buffers on final release we will leak the shadow buffer for just about every intent we create. Hence we start with this patch to close this condition off and ensure that when whiteouts start to be used we don't leak lots of memory. Signed-off-by: Dave Chinner Reviewed-by: Darrick J. Wong Reviewed-by: Allison Henderson Signed-off-by: Dave Chinner --- fs/xfs/xfs_bmap_item.c | 2 ++ fs/xfs/xfs_icreate_item.c | 1 + fs/xfs/xfs_refcount_item.c | 2 ++ fs/xfs/xfs_rmap_item.c | 2 ++ 4 files changed, 7 insertions(+) diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c index 593ac29..2c8b686 100644 --- a/fs/xfs/xfs_bmap_item.c +++ b/fs/xfs/xfs_bmap_item.c @@ -39,6 +39,7 @@ STATIC void xfs_bui_item_free( struct xfs_bui_log_item *buip) { + kmem_free(buip->bui_item.li_lv_shadow); kmem_cache_free(xfs_bui_cache, buip); } @@ -198,6 +199,7 @@ xfs_bud_item_release( struct xfs_bud_log_item *budp = BUD_ITEM(lip); xfs_bui_release(budp->bud_buip); + kmem_free(budp->bud_item.li_lv_shadow); kmem_cache_free(xfs_bud_cache, budp); } diff --git a/fs/xfs/xfs_icreate_item.c b/fs/xfs/xfs_icreate_item.c index 508e184..b05314d 100644 --- a/fs/xfs/xfs_icreate_item.c +++ b/fs/xfs/xfs_icreate_item.c @@ -63,6 +63,7 @@ STATIC void xfs_icreate_item_release( struct xfs_log_item *lip) { + kmem_free(ICR_ITEM(lip)->ic_item.li_lv_shadow); kmem_cache_free(xfs_icreate_cache, ICR_ITEM(lip)); } diff --git a/fs/xfs/xfs_refcount_item.c b/fs/xfs/xfs_refcount_item.c index 0d868c9..10474fe 100644 --- a/fs/xfs/xfs_refcount_item.c +++ b/fs/xfs/xfs_refcount_item.c @@ -35,6 +35,7 @@ STATIC void xfs_cui_item_free( struct xfs_cui_log_item *cuip) { + kmem_free(cuip->cui_item.li_lv_shadow); if (cuip->cui_format.cui_nextents > XFS_CUI_MAX_FAST_EXTENTS) kmem_free(cuip); else @@ -204,6 +205,7 @@ xfs_cud_item_release( struct xfs_cud_log_item *cudp = CUD_ITEM(lip); xfs_cui_release(cudp->cud_cuip); + kmem_free(cudp->cud_item.li_lv_shadow); kmem_cache_free(xfs_cud_cache, cudp); } diff --git a/fs/xfs/xfs_rmap_item.c b/fs/xfs/xfs_rmap_item.c index a22b2d1..6c0b56e 100644 --- a/fs/xfs/xfs_rmap_item.c +++ b/fs/xfs/xfs_rmap_item.c @@ -35,6 +35,7 @@ STATIC void xfs_rui_item_free( struct xfs_rui_log_item *ruip) { + kmem_free(ruip->rui_item.li_lv_shadow); if (ruip->rui_format.rui_nextents > XFS_RUI_MAX_FAST_EXTENTS) kmem_free(ruip); else @@ -227,6 +228,7 @@ xfs_rud_item_release( struct xfs_rud_log_item *rudp = RUD_ITEM(lip); xfs_rui_release(rudp->rud_ruip); + kmem_free(rudp->rud_item.li_lv_shadow); kmem_cache_free(xfs_rud_cache, rudp); } -- 2.7.4