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mm: huge_memory: handle strsep not finding delimiter

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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@gmail.com
Signed-off-by: Leo Stone <leocstone@gmail.com>
Reported-by: syzbot+8a3da2f1bbf59227c289@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=8a3da2f1bbf59227c289
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Leo Stone 2024-12-15 20:27:51 -08:00 • committed by Andrew Morton
parent 60da7445a1
commit d3ac65d274
1 changed files with 1 additions and 1 deletions
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2
mm/huge_memory.c
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@ -4169,7 +4169,7 @@ static ssize_t split_huge_pages_write(struct file *file, const char __user *buf,
size_t input_len = strlen(input_buf);
tok = strsep(&buf, ",");
if (tok) {
if (tok && buf) {
strscpy(file_path, tok);
} else {
ret = -EINVAL;