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usb: typec: ucsi: Fix command cancellation

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commit c4a8bfabef upstream.

The Cancel command was passed to the write callback as the
offset instead of as the actual command which caused NULL
pointer dereference.

Reported-by: Stephan Bolten <stephan.bolten@gmx.net>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217517
Fixes: 094902bc6a ("usb: typec: ucsi: Always cancel the command if PPM reports BUSY condition")
Cc: stable@vger.kernel.org
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Message-ID: <20230606115802.79339-1-heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus
2023-06-06 14:58:02 +03:00
committed by Greg Kroah-Hartman
parent b352f7b6a6
commit 2bf8ea2e9e
1 changed files with 7 additions and 4 deletions
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11
drivers/usb/typec/ucsi/ucsi.c
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@@ -132,10 +132,8 @@ static int ucsi_exec_command(struct ucsi *ucsi, u64 cmd)
if (ret) if (ret)
return ret; return ret;
if (cci & UCSI_CCI_BUSY) { if (cmd != UCSI_CANCEL && cci & UCSI_CCI_BUSY)
ucsi->ops->async_write(ucsi, UCSI_CANCEL, NULL, 0); return ucsi_exec_command(ucsi, UCSI_CANCEL);
return -EBUSY;
}
if (!(cci & UCSI_CCI_COMMAND_COMPLETE)) if (!(cci & UCSI_CCI_COMMAND_COMPLETE))
return -EIO; return -EIO;
@@ -149,6 +147,11 @@ static int ucsi_exec_command(struct ucsi *ucsi, u64 cmd)
return ucsi_read_error(ucsi); return ucsi_read_error(ucsi);
} }
if (cmd == UCSI_CANCEL && cci & UCSI_CCI_CANCEL_COMPLETE) {
ret = ucsi_acknowledge_command(ucsi);
return ret ? ret : -EBUSY;
}
return UCSI_CCI_LENGTH(cci); return UCSI_CCI_LENGTH(cci);
} }