[PATCH alsa-utils 3/5] aplay: Don't pass most negative integer to abs() in peak calculations

[Takashi Iwai]

The return value from abs() for the most negative integer is
undefined.  Cap it properly for the 32bit sample handling.

Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 aplay/aplay.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/aplay/aplay.c b/aplay/aplay.c
index c884346c9f25..2543de5b6cd8 100644
--- a/aplay/aplay.c
+++ b/aplay/aplay.c
@@ -1874,7 +1874,10 @@ static void compute_max_peak(u_char *data, size_t samples)
 			else
 				val = be32toh(*valp);
 			val ^= mask;
-			val = abs(val);
+			if (val == 0x80000000U)
+				val = 0x7fffffff;
+			else
+				val = abs(val);
 			if (max_peak[c] < val)
 				max_peak[c] = val;
 			valp++;
-- 
2.26.2