4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Daniel Thompson daniel.thompson@linaro.org
commit c07d35338081d107e57cf37572d8cc931a8e32e2 upstream.
kallsyms_symbol_next() returns a boolean (true on success). Currently kdb_read() tests the return value with an inequality that unconditionally evaluates to true.
This is fixed in the obvious way and, since the conditional branch is supposed to be unreachable, we also add a WARN_ON().
Reported-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Daniel Thompson daniel.thompson@linaro.org Signed-off-by: Jason Wessel jason.wessel@windriver.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- kernel/debug/kdb/kdb_io.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/debug/kdb/kdb_io.c +++ b/kernel/debug/kdb/kdb_io.c @@ -349,7 +349,7 @@ poll_again: } kdb_printf("\n"); for (i = 0; i < count; i++) { - if (kallsyms_symbol_next(p_tmp, i) < 0) + if (WARN_ON(!kallsyms_symbol_next(p_tmp, i))) break; kdb_printf("%s ", p_tmp); *(p_tmp + len) = '\0';