83 lines
3.2 KiB
Diff
83 lines
3.2 KiB
Diff
From fb2d40cc84f689e46138a81c57ccd1f234dbbb7c Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
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Date: Wed, 12 Jul 2023 17:46:57 +0200
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Subject: [PATCH 07/37] util/vfio-helpers: Use g_file_read_link()
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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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RH-Author: Cédric Le Goater <clg@redhat.com>
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RH-MergeRequest: 179: vfio: live migration support
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RH-Bugzilla: 2192818
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RH-Acked-by: Eric Auger <eric.auger@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [5/28] 3545a07c967782dba8dd081415232f91d3f600a9 (clegoate/qemu-kvm-c9s)
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Bugzilla: https://bugzilla.redhat.com/2192818
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commit dbdea0dbfe2c
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Author: Akihiko Odaki <akihiko.odaki@daynix.com>
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Date: Tue May 23 11:39:12 2023 +0900
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util/vfio-helpers: Use g_file_read_link()
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When _FORTIFY_SOURCE=2, glibc version is 2.35, and GCC version is
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12.1.0, the compiler complains as follows:
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In file included from /usr/include/features.h:490,
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from /usr/include/bits/libc-header-start.h:33,
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from /usr/include/stdint.h:26,
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from /usr/lib/gcc/aarch64-unknown-linux-gnu/12.1.0/include/stdint.h:9,
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from /home/alarm/q/var/qemu/include/qemu/osdep.h:94,
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from ../util/vfio-helpers.c:13:
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In function 'readlink',
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inlined from 'sysfs_find_group_file' at ../util/vfio-helpers.c:116:9,
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inlined from 'qemu_vfio_init_pci' at ../util/vfio-helpers.c:326:18,
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inlined from 'qemu_vfio_open_pci' at ../util/vfio-helpers.c:517:9:
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/usr/include/bits/unistd.h:119:10: error: argument 2 is null but the corresponding size argument 3 value is 4095 [-Werror=nonnull]
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119 | return __glibc_fortify (readlink, __len, sizeof (char),
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| ^~~~~~~~~~~~~~~
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This error implies the allocated buffer can be NULL. Use
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g_file_read_link(), which allocates buffer automatically to avoid the
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error.
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Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
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Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
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Reviewed-by: Cédric Le Goater <clg@redhat.com>
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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---
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util/vfio-helpers.c | 8 +++++---
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1 file changed, 5 insertions(+), 3 deletions(-)
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diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c
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index 2d8af38f88..f8bab46c68 100644
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--- a/util/vfio-helpers.c
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+++ b/util/vfio-helpers.c
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@@ -106,15 +106,17 @@ struct QEMUVFIOState {
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*/
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static char *sysfs_find_group_file(const char *device, Error **errp)
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{
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+ g_autoptr(GError) gerr = NULL;
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char *sysfs_link;
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char *sysfs_group;
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char *p;
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char *path = NULL;
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sysfs_link = g_strdup_printf("/sys/bus/pci/devices/%s/iommu_group", device);
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- sysfs_group = g_malloc0(PATH_MAX);
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- if (readlink(sysfs_link, sysfs_group, PATH_MAX - 1) == -1) {
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- error_setg_errno(errp, errno, "Failed to find iommu group sysfs path");
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+ sysfs_group = g_file_read_link(sysfs_link, &gerr);
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+ if (gerr) {
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+ error_setg(errp, "Failed to find iommu group sysfs path: %s",
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+ gerr->message);
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goto out;
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}
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p = strrchr(sysfs_group, '/');
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--
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2.39.3
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