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selftests/net: fix a char signedness issue

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Signedness of char is signed on x86_64, but unsigned on arm64.

Fix the warning building cmsg_sender.c on signed platforms or
forced with -fsigned-char:

    msg_sender.c:455:12:
    error: implicit conversion from 'int' to 'char'
    changes value from 128 to -128
    [-Werror,-Wconstant-conversion]
        buf[0] = ICMPV6_ECHO_REQUEST;

constant ICMPV6_ECHO_REQUEST is 128.

Link: https://lwn.net/Articles/911914
Fixes: de17e305a8 ("selftests: net: cmsg_sender: support icmp and raw sockets")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20231124171645.1011043-3-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Willem de Bruijn 2023-11-24 12:15:20 -05:00 committed by Jakub Kicinski
parent 0885598154
commit 7b29828c5a
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/net/cmsg_sender.c
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@ -416,9 +416,9 @@ int main(int argc, char *argv[])
{
struct addrinfo hints, *ai;
struct iovec iov[1];
unsigned char *buf;
struct msghdr msg;
char cbuf[1024];
char *buf;
int err;
int fd;