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