[PATCH] livepatch: Make error message explicitly for the overlength function name

[Minfei Huang]

For not, livepatch do not support the function which name is larger than
KSYM_NAME_LEN-1. It may be confusion user with error message
"livepatch: symbol 'xxx(function name)' not found in symbol table".

Make error message explicitly for overlength issue.

Signed-off-by: Minfei Huang <minfei.huang@xxxxxxxxxxx>
---
 kernel/livepatch/core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 3f9f1d6..d1f2404 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -789,6 +789,12 @@ static int klp_init_object(struct klp_patch *patch, struct klp_object *obj)
        return -ENOMEM;

    for (func = obj->funcs; func->old_name; func++) {
+       if (strlen(func->old_name) > (KSYM_NAME_LEN-1)) {
+           pr_err("%s is overlength, the max to be supported is %d\n",
+                   func->old_name, KSYM_NAME_LEN-1);
+           ret = -EINVAL;
+           goto free;
+       }
        ret = klp_init_func(obj, func);
        if (ret)
            goto free;
--
2.2.2

> 
> Best Regards,
> Petr
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