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| author | Colin Ian King <colin.king@canonical.com> | 2017-07-19 20:46:59 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-20 08:48:02 +0300 |
| commit | 1e6c22aef28364dcc5f03c04a05ec463bc2b3431 (patch) | |
| tree | 1ca42b7dbc6fc046a66b106936bcb63f4d330ad3 | |
| parent | 3753654e541938717b13f2b25791c3171a3a06aa (diff) | |
| download | linux-1e6c22aef28364dcc5f03c04a05ec463bc2b3431.tar.xz | |
net: tehuti: don't process data if it has not been copied from userspace
The array data is only populated with valid information from userspace
if cmd != SIOCDEVPRIVATE, other cases the array contains garbage on
the stack. The subsequent switch statement acts on a subcommand in
data[0] which could be any garbage value if cmd is SIOCDEVPRIVATE which
seems incorrect to me. Instead, just return EOPNOTSUPP for the case
where cmd == SIOCDEVPRIVATE to avoid this issue.
As a side note, I suspect that the original intention of the code
was for this ioctl to work just for cmd == SIOCDEVPRIVATE (and the
current logic is reversed). However, I don't wont to change the current
semantics in case any userspace code relies on this existing behaviour.
Detected by CoverityScan, CID#139647 ("Uninitialized scalar variable")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/tehuti/tehuti.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/ethernet/tehuti/tehuti.c b/drivers/net/ethernet/tehuti/tehuti.c index 711fbbbc4b1f..163d8d16bc24 100644 --- a/drivers/net/ethernet/tehuti/tehuti.c +++ b/drivers/net/ethernet/tehuti/tehuti.c @@ -654,6 +654,8 @@ static int bdx_ioctl_priv(struct net_device *ndev, struct ifreq *ifr, int cmd) RET(-EFAULT); } DBG("%d 0x%x 0x%x\n", data[0], data[1], data[2]); + } else { + return -EOPNOTSUPP; } if (!capable(CAP_SYS_RAWIO)) |