[PATCH 6.8 287/336] dyndbg: fix old BUG_ON in >control parser

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6.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jim Cromie <jim.cromie@xxxxxxxxx>

commit 00e7d3bea2ce7dac7bee1cf501fb071fd0ea8f6c upstream.

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 <stable@xxxxxxxxxx>
Signed-off-by: Jim Cromie <jim.cromie@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240429193145.66543-2-jim.cromie@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 lib/dynamic_debug.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -302,7 +302,11 @@ static int ddebug_tokenize(char *buf, ch
 		} 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 */






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