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| author | Jiri Kosina <jkosina@suse.cz> | 2012-12-06 13:59:28 +0400 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2012-12-06 13:59:28 +0400 |
| commit | 9afd09a1db93cc9084846c2b9bc0d1194743e5dc (patch) | |
| tree | 9ba2f25c20b765b0e47ea824534e8a29ee1a4c6f /drivers/hid | |
| parent | e5b50fe7bea43d0658773c89ba410ecc56867ee6 (diff) | |
| download | linux-9afd09a1db93cc9084846c2b9bc0d1194743e5dc.tar.xz | |
HID: i2c-hid: fix ret_count check
ret_count has to be at least 3, as we have to count the 2 bytes that are used
for the size of the reply. Without this, memcpy() might be called with zero or
negative count.
Reported-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/i2c-hid/i2c-hid.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c index ce01d5916184..6e1774c3a3f9 100644 --- a/drivers/hid/i2c-hid/i2c-hid.c +++ b/drivers/hid/i2c-hid/i2c-hid.c @@ -520,7 +520,7 @@ static int i2c_hid_get_raw_report(struct hid_device *hid, ret_count = ihid->inbuf[0] | (ihid->inbuf[1] << 8); - if (!ret_count) + if (ret_count <= 2) return 0; ret_count = min(ret_count, ask_count); |