[PATCH] libbpf: fix sign expansion bug in btf_dump_get_enum_value()

[Dan Carpenter <dan.carpenter@oracle.com>]

The code here is supposed to take a signed int and store it in a
signed long long.  Unfortunately, the way that the type promotion works
with this conditional statement is that it takes a signed int, type
promotes it to a __u32, and then stores that as a signed long long.
The result is never negative.

Fixes: d90ec262b35b ("libbpf: Add enum64 support for btf_dump")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 tools/lib/bpf/btf_dump.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c
index 400e84fd0578..627edb5bb6de 100644
--- a/tools/lib/bpf/btf_dump.c
+++ b/tools/lib/bpf/btf_dump.c
@@ -2045,7 +2045,7 @@ static int btf_dump_get_enum_value(struct btf_dump *d,
 		*value = *(__s64 *)data;
 		return 0;
 	case 4:
-		*value = is_signed ? *(__s32 *)data : *(__u32 *)data;
+		*value = is_signed ? (__s64)*(__s32 *)data : *(__u32 *)data;
 		return 0;
 	case 2:
 		*value = is_signed ? *(__s16 *)data : *(__u16 *)data;
-- 
2.35.1