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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2019-04-23 13:40:20 +0300 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@collabora.com> | 2019-05-06 09:15:02 +0300 |
| commit | 476c7e1d34f2a03b1aa5a924c50703053fe5f77c (patch) | |
| tree | 4b78b80c72c9e9a18e0bd34f352696b330af5f11 | |
| parent | 124dbd750da4a9bf494ae9d8cbed364058140731 (diff) | |
| download | linux-476c7e1d34f2a03b1aa5a924c50703053fe5f77c.tar.xz | |
i3c: Fix a shift wrap bug in i3c_bus_set_addr_slot_status()
The problem here is that addr can be I3C_BROADCAST_ADDR (126). That
means we're shifting by (126 * 2) % 64 which is 60. The
I3C_ADDR_SLOT_STATUS_MASK is an enum which is an unsigned int in GCC
so shifts greater than 31 are undefined.
Fixes: 3a379bbcea0a ("i3c: Add core I3C infrastructure")
Cc: <stable@vger.kernel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
| -rw-r--r-- | drivers/i3c/master.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index 2dc628d4f1ae..d539252eed79 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -385,8 +385,9 @@ static void i3c_bus_set_addr_slot_status(struct i3c_bus *bus, u16 addr, return; ptr = bus->addrslots + (bitpos / BITS_PER_LONG); - *ptr &= ~(I3C_ADDR_SLOT_STATUS_MASK << (bitpos % BITS_PER_LONG)); - *ptr |= status << (bitpos % BITS_PER_LONG); + *ptr &= ~((unsigned long)I3C_ADDR_SLOT_STATUS_MASK << + (bitpos % BITS_PER_LONG)); + *ptr |= (unsigned long)status << (bitpos % BITS_PER_LONG); } static bool i3c_bus_dev_addr_is_avail(struct i3c_bus *bus, u8 addr) |