On 6/16/24 3:11 PM, psykose wrote:
when using -fsanitize=undefined (which flags signed overflow which is
UB), a crash can be reproduced when building the linux kernel with BTF
info.
cast to unsigned first to make the overflow not invoke UB semantics- the
result is the same.
Signed-off-by: psykose <alice@xxxxxxxxx>
This seems against upstream libbpf repo. Could you do a proper patch
against bpf-next tree. Please have details how to reproduce the failure.
Please use proper name in your Signed-off-by.
---
src/btf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/btf.c b/src/btf.c
index 2d0840e..60cd412 100644
--- a/src/btf.c
+++ b/src/btf.c
@@ -3317,7 +3317,7 @@ struct btf_dedup {
static long hash_combine(long h, long value)
{
- return h * 31 + value;
+ return (long)((unsigned long)h * 31 + (unsigned long)value);
}
#define for_each_dedup_cand(d, node, hash) \
base-commit: 42065ea6627ff6e1ab4c65e51042a70fbf30ff7c
