linux-kernel - [PATCH 15/22] nvmet: Fix out-of-bounds stack access in nvmet_ctrl_state

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Message-ID: <f1f60858ee7a941863dc7f5506c540cb9f97b5f6.1742852847.git.jpoimboe@kernel.org>
Date: Mon, 24 Mar 2025 14:56:05 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Miroslav Benes <mbenes@...e.cz>,
	Brendan Jackman <jackmanb@...gle.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	Chaitanya Kulkarni <kch@...dia.com>,
	kernel test robot <lkp@...el.com>
Subject: [PATCH 15/22] nvmet: Fix out-of-bounds stack access in nvmet_ctrl_state_show()

The csts_state_names array only has six sparse entries, but the
iteration code in nvmet_ctrl_state_show() iterates seven, resulting in a
potential out-of-bounds stack read.  Fix that.

Fixes the following warning with an UBSAN kernel:

  vmlinux.o: warning: objtool: .text.nvmet_ctrl_state_show: unexpected end of section

Cc: Christoph Hellwig <hch@....de>
Cc: Sagi Grimberg <sagi@...mberg.me>
Cc: Chaitanya Kulkarni <kch@...dia.com>
Fixes: 649fd41420a8 ("nvmet: add debugfs support")
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202503171547.LlCTJLQL-lkp@intel.com/
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 drivers/nvme/target/debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/target/debugfs.c b/drivers/nvme/target/debugfs.c
index 220c7391fc19..c6571fbd35e3 100644
--- a/drivers/nvme/target/debugfs.c
+++ b/drivers/nvme/target/debugfs.c
@@ -78,7 +78,7 @@ static int nvmet_ctrl_state_show(struct seq_file *m, void *p)
 	bool sep = false;
 	int i;
 
-	for (i = 0; i < 7; i++) {
+	for (i = 0; i < ARRAY_SIZE(csts_state_names); i++) {
 		int state = BIT(i);
 
 		if (!(ctrl->csts & state))
-- 
2.48.1