linux-kernel - [tip: objtool/urgent] objtool, nvmet: Fix out-of-bounds stack access in nvmet_ctrl_state

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Message-ID: <174294059921.14745.13913646647268973086.tip-bot2@tip-bot2>
Date: Tue, 25 Mar 2025 22:09:59 -0000
From: "tip-bot2 for Josh Poimboeuf" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: kernel test robot <lkp@...el.com>, Josh Poimboeuf <jpoimboe@...nel.org>,
 Ingo Molnar <mingo@...nel.org>, Christoph Hellwig <hch@....de>,
 Sagi Grimberg <sagi@...mberg.me>, Chaitanya Kulkarni <kch@...dia.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: objtool/urgent] objtool, nvmet: Fix out-of-bounds stack access
 in nvmet_ctrl_state_show()

The following commit has been merged into the objtool/urgent branch of tip:

Commit-ID:     107a23185d990e3df6638d9a84c835f963fe30a6
Gitweb:        https://git.kernel.org/tip/107a23185d990e3df6638d9a84c835f963fe30a6
Author:        Josh Poimboeuf <jpoimboe@...nel.org>
AuthorDate:    Mon, 24 Mar 2025 14:56:05 -07:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 25 Mar 2025 23:00:15 +01:00

objtool, 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

Fixes: 649fd41420a8 ("nvmet: add debugfs support")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Christoph Hellwig <hch@....de>
Cc: Sagi Grimberg <sagi@...mberg.me>
Cc: Chaitanya Kulkarni <kch@...dia.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: https://lore.kernel.org/r/f1f60858ee7a941863dc7f5506c540cb9f97b5f6.1742852847.git.jpoimboe@kernel.org
Closes: https://lore.kernel.org/oe-kbuild-all/202503171547.LlCTJLQL-lkp@intel.com/
---
 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 220c739..c6571fb 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))