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memcg_write_event_control(): fix a user-triggerable oops

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commit 046667c4d3196938e992fba0dfcde570aa85cd0e upstream.

we are *not* guaranteed that anything past the terminating NUL
is mapped (let alone initialized with anything sane).

Fixes: 0dea116876 ("cgroup: implement eventfd-based generic API for notifications")
Cc: [email protected]
Cc: Andrew Morton <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Signed-off-by: Al Viro <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Al Viro 2024-07-21 14:45:08 -04:00 • committed by Greg Kroah-Hartman
commit 1b37ec85ad
1 changed files with 5 additions and 2 deletions
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7
mm/memcontrol.c
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@ -4732,9 +4732,12 @@ 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)