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Sun, 22 Feb 2026 02:39:39 -0800 (PST) From: Eric-Terminal To: Borislav Petkov Cc: Shubhrajyoti Datta , Tony Luck , linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org, Yufan Chen Subject: [PATCH] EDAC/versalnet: Fix resource leaks and NULL derefs in init_versalnet() Date: Sun, 22 Feb 2026 18:39:18 +0800 Message-ID: <20260222103918.90670-1-ericterminal@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2855; i=ericterminal@gmail.com; h=from:subject; bh=MqqYjtzX5p/PyN2Ymk/AdFx5hYQIvxPUZ1JbGwSv05w=; b=owGbwMvMwCXWM/dCzeS3H+sZT6slMWTOuq3PKLQier7r5P3Wb1wqOF6l6MQc23Rzk4Dp9JqyB Z43FwRN7ihlYRDjYpAVU2S5+3/f3FyvW3Oucx/OhZnDygQyhIGLUwAmIvuHkaG77WXf5a1/MjQd /n+bw35s4UzpKRv+fK8oTtmktSxvz8EzDP/z37RKTb7E6p0ZJZjBGDLrwyf3r7JLTof8WqE8dWG 8FzMLAA== X-Developer-Key: i=ericterminal@gmail.com; a=openpgp; fpr=DDFFBE9D6D4ADA9CD70BC36D8C9DD07C93EDF17F Content-Transfer-Encoding: 8bit From: Yufan Chen init_versalnet() has several bugs in its error handling: - kzalloc() and kmalloc() return values are used without NULL checks, causing a NULL pointer dereference when allocation fails. - The cleanup loop uses while (i--) which skips the current failing index, leaking the resources already allocated for that slot. - edac_mc_del_mc() is called unconditionally during unwind, even for controllers that were never registered with edac_mc_add_mc(). - sprintf() is used instead of snprintf() on a fixed-size buffer. Fix by adding NULL checks for dev and name allocations, replacing while (i--) with for (j = i; j >= 0; j--) to include the failing index, tracking successful edac_mc_add_mc() calls with a bool array, and switching to snprintf(). Signed-off-by: Yufan Chen --- drivers/edac/versalnet_edac.c | 29 ++++++++++++++++++++++++----- 1 file changed, 24 insertions(+), 5 deletions(-) diff --git a/drivers/edac/versalnet_edac.c b/drivers/edac/versalnet_edac.c index 1a1092793..128e9cd5f 100644 --- a/drivers/edac/versalnet_edac.c +++ b/drivers/edac/versalnet_edac.c @@ -764,11 +764,12 @@ static int init_versalnet(struct mc_priv *priv, struct platform_device *pdev) { u32 num_chans, rank, dwidth, config; struct edac_mc_layer layers[2]; + bool mc_added[NUM_CONTROLLERS] = { }; struct mem_ctl_info *mci; struct device *dev; enum dev_type dt; char *name; - int rc, i; + int rc, i, j; for (i = 0; i < NUM_CONTROLLERS; i++) { config = priv->adec[CONF + i * ADEC_NUM]; @@ -813,11 +814,25 @@ static int init_versalnet(struct mc_priv *priv, struct platform_device *pdev) priv->dwidth = dt; dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) { + rc = -ENOMEM; + goto err_alloc; + } + dev->release = versal_edac_release; name = kmalloc(32, GFP_KERNEL); - sprintf(name, "versal-net-ddrmc5-edac-%d", i); + if (!name) { + kfree(dev); + rc = -ENOMEM; + goto err_alloc; + } + + snprintf(name, 32, "versal-net-ddrmc5-edac-%d", i); dev->init_name = name; rc = device_register(dev); + kfree(name); + if (rc) + put_device(dev); if (rc) goto err_alloc; @@ -831,21 +846,25 @@ static int init_versalnet(struct mc_priv *priv, struct platform_device *pdev) edac_printk(KERN_ERR, EDAC_MC, "Failed to register MC%d with EDAC core\n", i); goto err_alloc; } + + mc_added[i] = true; } return 0; err_alloc: - while (i--) { - mci = priv->mci[i]; + for (j = i; j >= 0; j--) { + mci = priv->mci[j]; if (!mci) continue; if (mci->pdev) { device_unregister(mci->pdev); - edac_mc_del_mc(mci->pdev); + if (mc_added[j]) + edac_mc_del_mc(mci->pdev); } edac_mc_free(mci); + priv->mci[j] = NULL; } return rc; -- 2.47.3