[PATCH v8 01/35] dyndbg: fix old BUG_ON in >control parser

From: Jim Cromie <jim.cromie@gmail.com>
To: jbaron@akamai.com, gregkh@linuxfoundation.org,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	amd-gfx@lists.freedesktop.org,
	intel-gvt-dev@lists.freedesktop.org,
	intel-gfx@lists.freedesktop.org
Cc: ukaszb@chromium.org, linux-doc@vger.kernel.org,
	daniel.vetter@ffwll.ch, tvrtko.ursulin@linux.intel.com,
	jani.nikula@intel.com, ville.syrjala@linux.intel.com,
	seanpaul@chromium.org, robdclark@gmail.com, groeck@google.com,
	yanivt@google.com, bleung@google.com,
	Jim Cromie <jim.cromie@gmail.com>,
	stable@vger.kernel.org
Subject: [PATCH v8 01/35] dyndbg: fix old BUG_ON in >control parser
Date: Mon, 29 Apr 2024 13:31:11 -0600	[thread overview]
Message-ID: <20240429193145.66543-2-jim.cromie@gmail.com> (raw)
In-Reply-To: <20240429193145.66543-1-jim.cromie@gmail.com>

Fix a BUG_ON from 2009.  Even if it looks "unreachable" (I didn't
really look), lets make sure by removing it, doing pr_err and return
-EINVAL instead.

cc: stable@vger.kernel.org
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
 lib/dynamic_debug.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index c78f335fa981..f2c5e7910bb1 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -302,7 +302,11 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
 		} else {
 			for (end = buf; *end && !isspace(*end); end++)
 				;
-			BUG_ON(end == buf);
+			if (end == buf) {
+				pr_err("parse err after word:%d=%s\n", nwords,
+				       nwords ? words[nwords - 1] : "<none>");
+				return -EINVAL;
+			}
 		}
 
 		/* `buf' is start of word, `end' is one past its end */
-- 
2.44.0

