From: Alban Crequy <alban@xxxxxxxxxx>
"bpftool map create" has an infinite loop on "while (argc)". The error
case is missing.
Symptoms: when forgetting to type the keyword 'type' in front of 'hash':
$ sudo bpftool map create /sys/fs/bpf/dir/foobar hash key 8 value 8 entries 128
(infinite loop, taking all the CPU)
^C
After the patch:
$ sudo bpftool map create /sys/fs/bpf/dir/foobar hash key 8 value 8 entries 128
Error: unknown arg hash
Fixes: 0b592b5a01be ("tools: bpftool: add map create command")
Signed-off-by: Alban Crequy <alban@xxxxxxxxxx>
---
Changes in v2:
- Explain the cause of the bug in commitmsg
- Add the "fixes" line in the commitmsg (Jakub's review)
- Rebase on the bpf tree
v1 was initially based on bpf-next and submitted on
https://marc.info/?l=linux-kernel&m=155310327709613&w=2
---
tools/bpf/bpftool/map.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c
index 05b029b934a6..1ccc38718458 100644
--- a/tools/bpf/bpftool/map.c
+++ b/tools/bpf/bpftool/map.c
@@ -1151,6 +1151,9 @@ static int do_create(int argc, char **argv)
return -1;
}
NEXT_ARG();
+ } else {
+ p_err("unknown arg %s", *argv);
+ return -1;
}
}
--
2.20.1
