6.6-stable review patch. If anyone has any objections, please let me know.
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From: Christophe JAILLET christophe.jaillet@wanadoo.fr
[ Upstream commit adb1f95d388a43c4c564ef3e436f18900dde978e ]
The ending NULL is not taken into account by strncat(), so switch to strlcat() to correctly compute the size of the available memory when appending CONFIG_CMDLINE to 'early_cmdline'.
Fixes: 26e7aacb83df ("riscv: Allow to downgrade paging mode from the command line") Signed-off-by: Christophe JAILLET christophe.jaillet@wanadoo.fr Reviewed-by: Alexandre Ghiti alexghiti@rivosinc.com Link: https://lore.kernel.org/r/9f66d2b58c8052d4055e90b8477ee55d9a0914f9.169856402... Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/riscv/kernel/pi/cmdline_early.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/arch/riscv/kernel/pi/cmdline_early.c b/arch/riscv/kernel/pi/cmdline_early.c index 68e786c84c94..f6d4dedffb84 100644 --- a/arch/riscv/kernel/pi/cmdline_early.c +++ b/arch/riscv/kernel/pi/cmdline_early.c @@ -38,8 +38,7 @@ static char *get_early_cmdline(uintptr_t dtb_pa) if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) || IS_ENABLED(CONFIG_CMDLINE_FORCE) || fdt_cmdline_size == 0 /* CONFIG_CMDLINE_FALLBACK */) { - strncat(early_cmdline, CONFIG_CMDLINE, - COMMAND_LINE_SIZE - fdt_cmdline_size); + strlcat(early_cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE); }
return early_cmdline;