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slimbus: avoid null pointer dereference on msg

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The pointer msg is checked to see if it is null at the start of
the function and jumps to the error exit label reterr that then
dereferences msg when it prints a dev_err error message. Avoid
this potential null pointer dereference by only printing the
error message if msg is not null.

Detected by CoverityScan, CID#1463141 ("Dereference after null check")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Colin Ian King 2018-01-02 17:54:19 +00:00 committed by Greg Kroah-Hartman
parent 0edff03d44
commit 7dde60c06c
1 changed files with 3 additions and 2 deletions
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5
drivers/slimbus/messaging.c
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@ -170,8 +170,9 @@ static int slim_val_inf_sanity(struct slim_controller *ctrl,
break;
}
reterr:
dev_err(ctrl->dev, "Sanity check failed:msg:offset:0x%x, mc:%d\n",
msg->start_offset, mc);
if (msg)
dev_err(ctrl->dev, "Sanity check failed:msg:offset:0x%x, mc:%d\n",
msg->start_offset, mc);
return -EINVAL;
}