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This has been harmless so far because the clients (TI-SCI) always passed its preallocated message buffer, which is sized to the maximum message size (60 or 64 bytes, a multiple of 4), so the extra bytes read were still within the buffer. But, with a later TI-SCI update, the message size can be varying now and not guaranteed to be a multiple of 4, which would trigger KASAN out-of-bounds reports. Therefore, Build the trailing word by reading one byte at a time, only up to the message length. The value written to the register is unchanged. Signed-off-by: Beleswar Padhi --- drivers/mailbox/ti-msgmgr.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/mailbox/ti-msgmgr.c b/drivers/mailbox/ti-msgmgr.c index 425d5f9d9d0e3..44457a896510f 100644 --- a/drivers/mailbox/ti-msgmgr.c +++ b/drivers/mailbox/ti-msgmgr.c @@ -425,10 +425,18 @@ static int ti_msgmgr_send_data(struct mbox_chan *chan, void *data) trail_bytes = message->len % sizeof(u32); if (trail_bytes) { - u32 data_trail = *word_data; - - /* Ensure all unused data is 0 */ - data_trail &= 0xFFFFFFFF >> (8 * (sizeof(u32) - trail_bytes)); + /* + * Read the trailing bytes one at a time instead of as a full + * u32, as the message buffer may end right after them and a + * u32 read would go past the end of it. This also leaves all + * unused data as 0. + */ + u8 *byte_data = (u8 *)word_data; + u32 data_trail = 0; + int i; + + for (i = 0; i < trail_bytes; i++) + data_trail |= byte_data[i] << (8 * i); writel(data_trail, data_reg); data_reg += sizeof(u32); } -- 2.34.1