* [PATCH] arm64: idreg-override: Detect trailing "--" in __parse_cmdline()
@ 2026-10-15 16:10 Thorsten Blum
0 siblings, 0 replies; only message in thread
From: Thorsten Blum @ 2026-10-15 16:10 UTC (permalink / raw)
To: Catalin Marinas, Will Deacon, Mark Rutland, Robin Murphy,
Oliver Upton, Yureka Lilian, Marc Zyngier, Ard Biesheuvel
Cc: Thorsten Blum, linux-arm-kernel, linux-kernel
__parse_cmdline() detects "--" only if it is followed by whitespace.
However, at the end of the command line, it converts the dashes to
underscores and tries to match "__" as an option.
Detect trailing "--" directly instead of converting it to "__".
Fixes: dc3f5aae0638 ("arm64: idreg-override: Avoid parameq() and parameqn()")
Signed-off-by: Thorsten Blum <blum@kernel.org>
---
arch/arm64/kernel/pi/idreg-override.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kernel/pi/idreg-override.c b/arch/arm64/kernel/pi/idreg-override.c
index acaf56234973..38aa28d19650 100644
--- a/arch/arm64/kernel/pi/idreg-override.c
+++ b/arch/arm64/kernel/pi/idreg-override.c
@@ -352,8 +352,9 @@ static __init void __parse_cmdline(const char *cmdline, bool parse_aliases)
cmdline = skip_spaces(cmdline);
- /* terminate on "--" appearing on the command line by itself */
- if (cmdline[0] == '-' && cmdline[1] == '-' && isspace(cmdline[2]))
+ /* Stop at "--" appearing as a separate argument. */
+ if (cmdline[0] == '-' && cmdline[1] == '-' &&
+ (!cmdline[2] || isspace(cmdline[2])))
return;
for (len = 0; cmdline[len] && !isspace(cmdline[len]); len++) {
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