[PATCH] kallsyms: don't leak address when printing symbol

[Tobin C. Harding]

Currently if a pointer is printed using %p[ssB] and the symbol is not
found (kallsyms_lookup() fails) then we print the actual address. This
leaks kernel addresses. We should instead print something _safe_.

Print "<no-symbol>" instead of kernel address.

Signed-off-by: Tobin C. Harding <m...@tobin.cc>
---
 kernel/kallsyms.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 127e7cfafa55..182e7592be9c 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -390,7 +390,7 @@ static int __sprint_symbol(char *buffer, unsigned long 
address,
        address += symbol_offset;
        name = kallsyms_lookup(address, &size, &offset, &modname, buffer);
        if (!name)
-               return sprintf(buffer, "0x%lx", address - symbol_offset);
+               return sprintf(buffer, "<no-symbol>");
 
        if (name != buffer)
                strcpy(buffer, name);
-- 
2.7.4