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memcg_write_event_control() oops fix

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Merge tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull memcg-v1 fix from Al Viro:
 "memcg_write_event_control() oops fix"

* tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  memcg_write_event_control(): fix a user-triggerable oops
This commit is contained in:
Linus Torvalds 2024-08-16 17:08:02 -07:00
commit e5fa841af6
1 changed files with 5 additions and 2 deletions
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7
mm/memcontrol-v1.c
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@ -1842,9 +1842,12 @@ static ssize_t memcg_write_event_control(struct kernfs_open_file *of,
buf = endp + 1;
cfd = simple_strtoul(buf, &endp, 10);
if ((*endp != ' ') && (*endp != '\0'))
if (*endp == '\0')
buf = endp;
else if (*endp == ' ')
buf = endp + 1;
else
return -EINVAL;
buf = endp + 1;
event = kzalloc(sizeof(*event), GFP_KERNEL);
if (!event)