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* [PATCH] tools: iio: iio_generic_buffer: make num_loops signed
@ 2019-01-11 23:03 Martin Kelly
  0 siblings, 0 replies; 1+ messages in thread
From: Martin Kelly @ 2019-01-11 23:03 UTC (permalink / raw)
  To: linux-iio; +Cc: Jonathan Cameron, Martin Kelly, Dan Carpenter

Currently, num_loops is unsigned, but it's set by strtoll, which returns a
(signed) long long int. This could lead to overflow, and it also makes the
check "num_loops < 0" always be false, since num_loops is unsigned.
Setting num_loops to -1 to loop forever is almost working because num_loops
is getting set to a very high number, but it's technically still incorrect.

Fix this issue by making num_loops signed. This also fixes an error found
by Smatch.

Signed-off-by: Martin Kelly <>
Reported-by: Dan Carpenter <>
 tools/iio/iio_generic_buffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/iio/iio_generic_buffer.c b/tools/iio/iio_generic_buffer.c
index 3040830d7797..84545666a09c 100644
--- a/tools/iio/iio_generic_buffer.c
+++ b/tools/iio/iio_generic_buffer.c
@@ -330,7 +330,7 @@ static const struct option longopts[] = {
 int main(int argc, char **argv)
-	unsigned long long num_loops = 2;
+	long long num_loops = 2;
 	unsigned long timedelay = 1000000;
 	unsigned long buf_len = 128;

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2019-01-11 23:03 [PATCH] tools: iio: iio_generic_buffer: make num_loops signed Martin Kelly

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