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| author | Jim Cromie <jim.cromie@gmail.com> | 2020-12-09 21:36:25 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-09 22:10:12 +0300 |
| commit | 3577afb0052fca65e67efdfc8e0859bb7bac87a6 (patch) | |
| tree | 2ad8e1d53a39133addaf81c5b9325753f8bdd711 /lib/dynamic_debug.c | |
| parent | 0b81144a4ac20f0757b7c965d2fa57de367c7db5 (diff) | |
| download | linux-3577afb0052fca65e67efdfc8e0859bb7bac87a6.tar.xz | |
dyndbg: fix use before null check
In commit a2d375eda771 ("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: a2d375eda771 ("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>
Diffstat (limited to 'lib/dynamic_debug.c')
| -rw-r--r-- | lib/dynamic_debug.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index bd7b3aaa93c3..c70d6347afa2 100644 --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c @@ -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); |