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70 lines
2.1 KiB
70 lines
2.1 KiB
From c4af0f3ab992977d7fde65240a15481a1adc859c Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Jos=C3=A9=20Exp=C3=B3sito?= <jexposit@redhat.com>
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Date: Tue, 19 Mar 2024 13:45:19 +0100
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Subject: [PATCH] vgaarb: Check snprintf return value
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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snprintf() might return a negative value if an error occurs.
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Check its return value before using it in vgaarb_write().
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Signed-off-by: José Expósito <jexposit@redhat.com>
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---
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src/common_vgaarb.c | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/src/common_vgaarb.c b/src/common_vgaarb.c
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index 515275f..a1edfab 100644
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--- a/src/common_vgaarb.c
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+++ b/src/common_vgaarb.c
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@@ -238,6 +238,8 @@ pci_device_vgaarb_set_target(struct pci_device *dev)
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len = snprintf(buf, BUFSIZE, "target PCI:%04x:%02x:%02x.%x",
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dev->domain, dev->bus, dev->dev, dev->func);
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+ if (len < 0 || len >= BUFSIZE)
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+ return -1;
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ret = vgaarb_write(pci_sys->vgaarb_fd, buf, len);
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if (ret)
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@@ -268,6 +270,9 @@ pci_device_vgaarb_decodes(int new_vgaarb_rsrc)
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return 0;
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len = snprintf(buf, BUFSIZE, "decodes %s", rsrc_to_str(new_vgaarb_rsrc));
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+ if (len < 0 || len >= BUFSIZE)
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+ return -1;
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+
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ret = vgaarb_write(pci_sys->vgaarb_fd, buf, len);
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if (ret == 0)
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dev->vgaarb_rsrc = new_vgaarb_rsrc;
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@@ -297,6 +302,8 @@ pci_device_vgaarb_lock(void)
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return 0;
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len = snprintf(buf, BUFSIZE, "lock %s", rsrc_to_str(dev->vgaarb_rsrc));
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+ if (len < 0 || len >= BUFSIZE)
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+ return -1;
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return vgaarb_write(pci_sys->vgaarb_fd, buf, len);
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}
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@@ -315,6 +322,8 @@ pci_device_vgaarb_trylock(void)
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return 0;
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len = snprintf(buf, BUFSIZE, "trylock %s", rsrc_to_str(dev->vgaarb_rsrc));
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+ if (len < 0 || len >= BUFSIZE)
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+ return -1;
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return vgaarb_write(pci_sys->vgaarb_fd, buf, len);
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}
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@@ -333,6 +342,8 @@ pci_device_vgaarb_unlock(void)
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return 0;
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len = snprintf(buf, BUFSIZE, "unlock %s", rsrc_to_str(dev->vgaarb_rsrc));
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+ if (len < 0 || len >= BUFSIZE)
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+ return -1;
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return vgaarb_write(pci_sys->vgaarb_fd, buf, len);
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}
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--
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2.44.0
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