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HID: hid-lg4ff: Add check for empty lbuf

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commit d180b6496143cd360c5d5f58ae4b9a8229c1f344 upstream.

If an empty buf is received, lbuf is also empty. So lbuf is
accessed by index -1.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: f31a2de3fe ("HID: hid-lg4ff: Allow switching of Logitech gaming wheels between compatibility modes")
Signed-off-by: Anastasia Belova <abelova@astralinux.ru>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anastasia Belova 2022-11-11 15:55:11 +03:00 committed by Greg Kroah-Hartman
parent a31cd9d836
commit fbd83b3f7e
1 changed files with 6 additions and 0 deletions
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6
drivers/hid/hid-lg4ff.c
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@ -878,6 +878,12 @@ static ssize_t lg4ff_alternate_modes_store(struct device *dev, struct device_att
return -ENOMEM;
i = strlen(lbuf);
if (i == 0) {
kfree(lbuf);
return -EINVAL;
}
if (lbuf[i-1] == '\n') {
if (i == 1) {
kfree(lbuf);