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dyndbg: fix use before null check 

In commit a2d375eda7 ("dyndbg: refine export, rename to
dynamic_debug_exec_queries()"), a string is copied before checking it
isn't NULL.  Fix this, report a usage/interface error, and return the
proper error code.

Fixes: a2d375eda7 ("dyndbg: refine export, rename to dynamic_debug_exec_queries()")
Cc: stable@vger.kernel.org
--
-v2 drop comment tweak, improve commit message

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20201209183625.2432329-1-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jim Cromie 2020-12-09 11:36:25 -07:00 committed by Greg Kroah-Hartman
parent 0b81144a4a
commit 3577afb005
1 changed files with 7 additions and 2 deletions
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9
lib/dynamic_debug.c
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@ -561,9 +561,14 @@ static int ddebug_exec_queries(char *query, const char *modname)
int dynamic_debug_exec_queries(const char *query, const char *modname)
{
int rc;
char *qry = kstrndup(query, PAGE_SIZE, GFP_KERNEL);
char *qry; /* writable copy of query */
if (!query)
if (!query) {
pr_err("non-null query/command string expected\n");
return -EINVAL;
}
qry = kstrndup(query, PAGE_SIZE, GFP_KERNEL);
if (!qry)
return -ENOMEM;
rc = ddebug_exec_queries(qry, modname);