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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2020-05-05 11:25:56 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-05-05 18:27:03 +0300 |
| commit | 3b5af3171e2d5a73ae6f04965ed653d039904eb6 (patch) | |
| tree | 40ecc19c0e87ea2777814bea7c3aaea7ac4b1c54 /drivers/media/cec/core/cec-adap.c | |
| parent | 62eedb356188376acd0368384a9b294d5180c00b (diff) | |
| download | linux-3b5af3171e2d5a73ae6f04965ed653d039904eb6.tar.xz | |
media: cec: silence shift wrapping warning in __cec_s_log_addrs()
The log_addrs->log_addr_type[i] value is a u8 which is controlled by
the user and comes from the ioctl. If it's over 31 then that results in
undefined behavior (shift wrapping) and that leads to a Smatch static
checker warning. We already cap the value later so we can silence the
warning just by re-ordering the existing checks.
I think the UBSan checker will also catch this bug at runtime and
generate a warning. But otherwise the bug is harmless.
Fixes: 9881fe0ca187 ("[media] cec: add HDMI CEC framework (adapter)")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media/cec/core/cec-adap.c')
| -rw-r--r-- | drivers/media/cec/core/cec-adap.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/media/cec/core/cec-adap.c b/drivers/media/cec/core/cec-adap.c index 6c95dc471d4c..6a04d19a96b2 100644 --- a/drivers/media/cec/core/cec-adap.c +++ b/drivers/media/cec/core/cec-adap.c @@ -1734,6 +1734,10 @@ int __cec_s_log_addrs(struct cec_adapter *adap, unsigned j; log_addrs->log_addr[i] = CEC_LOG_ADDR_INVALID; + if (log_addrs->log_addr_type[i] > CEC_LOG_ADDR_TYPE_UNREGISTERED) { + dprintk(1, "unknown logical address type\n"); + return -EINVAL; + } if (type_mask & (1 << log_addrs->log_addr_type[i])) { dprintk(1, "duplicate logical address type\n"); return -EINVAL; @@ -1754,10 +1758,6 @@ int __cec_s_log_addrs(struct cec_adapter *adap, dprintk(1, "invalid primary device type\n"); return -EINVAL; } - if (log_addrs->log_addr_type[i] > CEC_LOG_ADDR_TYPE_UNREGISTERED) { - dprintk(1, "unknown logical address type\n"); - return -EINVAL; - } for (j = 0; j < feature_sz; j++) { if ((features[j] & 0x80) == 0) { if (op_is_dev_features) |