The patch titled Subject: ocfs2: fix panic in failed foilio allocation has been added to the -mm mm-nonmm-unstable branch. Its filename is v2-ocfs2-fix-panic-in-failed-foilio-allocation.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-nonmm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Mark Tinguely mark.tinguely@oracle.com Subject: ocfs2: fix panic in failed foilio allocation Date: Fri, 11 Apr 2025 11:31:24 -0500

In the page to order 0 folio conversion series, commits 7e119cff9d0a ("ocfs2: convert w_pages to w_folios") and 9a5e08652dc4 ("ocfs2: use an array of folios instead of an array of pages") save -ENOMEM in the folio array upon allocation failure and call the folio array free code.

The folio array free code expects either valid folio pointers or NULL. Finding the -ENOMEM will result in a panic. Fix by NULLing the error folio entry.

Link: https://lkml.kernel.org/r/c879a52b-835c-4fa0-902b-8b2e9196dcbd@oracle.com Fixes: 7e119cff9d0a ("ocfs2: convert w_pages to w_folios") FIxes: 9a5e08652dc4 ("ocfs2: use an array of folios instead of an array of pages") Signed-off-by: Mark Tinguely mark.tinguely@oracle.com Reviewed-by: Matthew Wilcox (Oracle) willy@infradead.org Reviewed-by: Joseph Qi joseph.qi@linux.alibaba.com Cc: Changwei Ge gechangwei@live.cn Cc: Joel Becker jlbec@evilplan.org Cc: Junxiao Bi junxiao.bi@oracle.com Cc: Mark Fasheh mark@fasheh.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

fs/ocfs2/alloc.c | 1 + fs/ocfs2/aops.c | 1 + 2 files changed, 2 insertions(+)

--- a/fs/ocfs2/alloc.c~v2-ocfs2-fix-panic-in-failed-foilio-allocation +++ a/fs/ocfs2/alloc.c @@ -6918,6 +6918,7 @@ static int ocfs2_grab_folios(struct inod if (IS_ERR(folios[numfolios])) { ret = PTR_ERR(folios[numfolios]); mlog_errno(ret); + folios[numfolios] = NULL; goto out; }

--- a/fs/ocfs2/aops.c~v2-ocfs2-fix-panic-in-failed-foilio-allocation +++ a/fs/ocfs2/aops.c @@ -1071,6 +1071,7 @@ static int ocfs2_grab_folios_for_write(s if (IS_ERR(wc->w_folios[i])) { ret = PTR_ERR(wc->w_folios[i]); mlog_errno(ret); + wc->w_folios[i] = NULL; goto out; } } _

Patches currently in -mm which might be from mark.tinguely@oracle.com are

v2-ocfs2-fix-panic-in-failed-foilio-allocation.patch