The patch titled
Subject: mm: huge_memory: handle strsep not finding delimiter
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-huge_memory-handle-strsep-not-finding-delimiter.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-huge_memory-handle-strsep-not-finding-delimiter.patch
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: Leo Stone <leocstone@xxxxxxxxx>
Subject: mm: huge_memory: handle strsep not finding delimiter
Date: Sun, 15 Dec 2024 20:27:51 -0800
split_huge_pages_write() does not handle the case where strsep finds no
delimiter in the given string and sets the input buffer to NULL, which
allows this reproducer to trigger a protection fault.
Link: https://lkml.kernel.org/r/20241216042752.257090-2-leocstone@xxxxxxxxx
Signed-off-by: Leo Stone <leocstone@xxxxxxxxx>
Reported-by: syzbot+8a3da2f1bbf59227c289@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://syzkaller.appspot.com/bug?extid=8a3da2f1bbf59227c289
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/huge_memory.c~mm-huge_memory-handle-strsep-not-finding-delimiter
+++ a/mm/huge_memory.c
@@ -4169,7 +4169,7 @@ static ssize_t split_huge_pages_write(st
size_t input_len = strlen(input_buf);
tok = strsep(&buf, ",");
- if (tok) {
+ if (tok && buf) {
strscpy(file_path, tok);
} else {
ret = -EINVAL;
_
Patches currently in -mm which might be from leocstone@xxxxxxxxx are
mm-huge_memory-handle-strsep-not-finding-delimiter.patch
