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kdb: Fix handling of kallsyms_symbol_next() return value

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commit c07d353380 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>
This commit is contained in:
Daniel Thompson 2015-03-02 14:13:36 +00:00 committed by Greg Kroah-Hartman
parent 01b43f2e3c
commit 425704be09
1 changed files with 1 additions and 1 deletions
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2
kernel/debug/kdb/kdb_io.c
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@ -350,7 +350,7 @@ static char *kdb_read(char *buffer, size_t bufsize)
}
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';