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Subject[PATCH 4.9 15/54] i2c: cpm: Fix i2c_ram structure
Date
From: Nicolas VINCENT <nicolas.vincent@vossloh.com>

[ Upstream commit a2bd970aa62f2f7f80fd0d212b1d4ccea5df4aed ]

the i2c_ram structure is missing the sdmatmp field mentionned in
datasheet for MPC8272 at paragraph 36.5. With this field missing, the
hardware would write past the allocated memory done through
cpm_muram_alloc for the i2c_ram structure and land in memory allocated
for the buffers descriptors corrupting the cbd_bufaddr field. Since this
field is only set during setup(), the first i2c transaction would work
and the following would send data read from an arbitrary memory
location.

Fixes: 61045dbe9d8d ("i2c: Add support for I2C bus on Freescale CPM1/CPM2 controllers")
Signed-off-by: Nicolas VINCENT <nicolas.vincent@vossloh.com>
Acked-by: Jochen Friedrich <jochen@scram.de>
Acked-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/i2c/busses/i2c-cpm.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/i2c/busses/i2c-cpm.c b/drivers/i2c/busses/i2c-cpm.c
index d89bde2c5da25..cf285b97a6422 100644
--- a/drivers/i2c/busses/i2c-cpm.c
+++ b/drivers/i2c/busses/i2c-cpm.c
@@ -74,6 +74,9 @@ struct i2c_ram {
char res1[4]; /* Reserved */
ushort rpbase; /* Relocation pointer */
char res2[2]; /* Reserved */
+ /* The following elements are only for CPM2 */
+ char res3[4]; /* Reserved */
+ uint sdmatmp; /* Internal */
};

#define I2COM_START 0x80
--
2.25.1


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