Commit 9b633ad4 authored by Sasha Levin's avatar Sasha Levin Committed by Luis Henriques

power: test_power: correctly handle empty writes

commit 6b9140f3 upstream.

Writing 0 length data into test_power makes it access an invalid array
location and kill the system.

Fixes: f17ef9b2 ("power: Make test_power driver more dynamic.")
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
Signed-off-by: default avatarSebastian Reichel <sre@kernel.org>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 6342a172
......@@ -275,6 +275,8 @@ static int map_get_value(struct battery_property_map *map, const char *key,
buf[MAX_KEYLENGTH-1] = '\0';
cr = strnlen(buf, MAX_KEYLENGTH) - 1;
if (cr < 0)
return def_val;
if (buf[cr] == '\n')
buf[cr] = '\0';
......
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