The patch titled Subject: hugetlb: fix NULL pointer dereference in trace_hugetlbfs_alloc_inode has been added to the -mm mm-hotfixes-unstable branch. Its filename is hugetlb-fix-null-pointer-dereference-in-trace_hugetlbfs_alloc_inode.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Muchun Song songmuchun@bytedance.com Subject: hugetlb: fix NULL pointer dereference in trace_hugetlbfs_alloc_inode Date: Mon, 6 Jan 2025 11:31:17 +0800

hugetlb_file_setup() will pass a NULL @dir to hugetlbfs_get_inode(), so we will access a NULL pointer for @dir. Fix it and set __entry->dr to 0 if @dir is NULL. Because ->i_ino cannot be 0 (see get_next_ino()), there is no confusing if user sees a 0 inode number.

Link: https://lkml.kernel.org/r/20250106033118.4640-1-songmuchun@bytedance.com Fixes: 318580ad7f28 ("hugetlbfs: support tracepoint") Signed-off-by: Muchun Song songmuchun@bytedance.com Reported-by: Cheung Wall zzqq0103.hey@gmail.com Closes: https://lore.kernel.org/linux-mm/02858D60-43C1-4863-A84F-3C76A8AF1F15@linux.... Reviewed-by: Hongbo Li lihongbo22@huawei.com Cc: cheung wall zzqq0103.hey@gmail.com Cc: Christian Brauner brauner@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

include/trace/events/hugetlbfs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/trace/events/hugetlbfs.h~hugetlb-fix-null-pointer-dereference-in-trace_hugetlbfs_alloc_inode +++ a/include/trace/events/hugetlbfs.h @@ -23,7 +23,7 @@ TRACE_EVENT(hugetlbfs_alloc_inode, TP_fast_assign( __entry->dev = inode->i_sb->s_dev; __entry->ino = inode->i_ino; - __entry->dir = dir->i_ino; + __entry->dir = dir ? dir->i_ino : 0; __entry->mode = mode; ),

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Patches currently in -mm which might be from songmuchun@bytedance.com are

hugetlb-fix-null-pointer-dereference-in-trace_hugetlbfs_alloc_inode.patch