linux-kernel - [PATCH] i3c: master: dw: check return of dw_i3c_master_get_free

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Message-Id: <20220108150948.3988790-1-trix@redhat.com>
Date:   Sat,  8 Jan 2022 07:09:48 -0800
From:   trix@...hat.com
To:     vitor.soares@...opsys.com, alexandre.belloni@...tlin.com,
        nathan@...nel.org, ndesaulniers@...gle.com, bbrezillon@...nel.org
Cc:     linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Tom Rix <trix@...hat.com>
Subject: [PATCH] i3c: master: dw: check return of dw_i3c_master_get_free_pos()

From: Tom Rix <trix@...hat.com>

Clang static analysis reports this problem
dw-i3c-master.c:799:9: warning: The result of the left shift is
  undefined because the left operand is negative
                      COMMAND_PORT_DEV_INDEX(pos) |
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~

pos can be negative because dw_i3c_master_get_free_pos() can return an
error.  So check for an error.

Fixes: 1dd728f5d4d4 ("i3c: master: Add driver for Synopsys DesignWare IP")
Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/i3c/master/dw-i3c-master.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
index 03a368da51b95..51a8608203de7 100644
--- a/drivers/i3c/master/dw-i3c-master.c
+++ b/drivers/i3c/master/dw-i3c-master.c
@@ -793,6 +793,10 @@ static int dw_i3c_master_daa(struct i3c_master_controller *m)
 		return -ENOMEM;
 
 	pos = dw_i3c_master_get_free_pos(master);
+	if (pos < 0) {
+		dw_i3c_master_free_xfer(xfer);
+		return pos;
+	}
 	cmd = &xfer->cmds[0];
 	cmd->cmd_hi = 0x1;
 	cmd->cmd_lo = COMMAND_PORT_DEV_COUNT(master->maxdevs - pos) |
-- 
2.26.3