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sd/pl181.c: Avoid undefined shift behaviour in RWORD macro 

Add a cast to avoid potentially shifting into the sign bit of
a signed value, which is undefined behaviour in C.

(Detected with clang's -fsanitize=undefined.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1372341831-4264-1-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2013-06-27 15:03:51 +01:00
parent 528622421e
commit 8827b0fb66
1 changed files with 1 additions and 1 deletions
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2
hw/sd/pl181.c
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@ -175,7 +175,7 @@ static void pl181_send_command(pl181_state *s)
if (rlen < 0)
goto error;
if (s->cmd & PL181_CMD_RESPONSE) {
#define RWORD(n) ((response[n] << 24) | (response[n + 1] << 16) \
#define RWORD(n) (((uint32_t)response[n] << 24) | (response[n + 1] << 16) \
| (response[n + 2] << 8) | response[n + 3])
if (rlen == 0 || (rlen == 4 && (s->cmd & PL181_CMD_LONGRESP)))
goto error;