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| author | Akihiko Odaki <akihiko.odaki@daynix.com> | 2023-05-23 11:39:12 +0900 |
|---|---|---|
| committer | Cédric Le Goater <clg@redhat.com> | 2023-05-24 09:21:22 +0200 |
| commit | dbdea0dbfe2cef9ef6c752e9077e4fc98724194c (patch) | |
| tree | 8157944386846e34964ce14511b2c1b3c12a1a2e | |
| parent | b83b40b614846b86e69f1680aec379594dc77d6b (diff) | |
| download | qemu-dbdea0dbfe2cef9ef6c752e9077e4fc98724194c.zip qemu-dbdea0dbfe2cef9ef6c752e9077e4fc98724194c.tar.gz qemu-dbdea0dbfe2cef9ef6c752e9077e4fc98724194c.tar.bz2 | |
util/vfio-helpers: Use g_file_read_link()
When _FORTIFY_SOURCE=2, glibc version is 2.35, and GCC version is
12.1.0, the compiler complains as follows:
In file included from /usr/include/features.h:490,
from /usr/include/bits/libc-header-start.h:33,
from /usr/include/stdint.h:26,
from /usr/lib/gcc/aarch64-unknown-linux-gnu/12.1.0/include/stdint.h:9,
from /home/alarm/q/var/qemu/include/qemu/osdep.h:94,
from ../util/vfio-helpers.c:13:
In function 'readlink',
inlined from 'sysfs_find_group_file' at ../util/vfio-helpers.c:116:9,
inlined from 'qemu_vfio_init_pci' at ../util/vfio-helpers.c:326:18,
inlined from 'qemu_vfio_open_pci' at ../util/vfio-helpers.c:517:9:
/usr/include/bits/unistd.h:119:10: error: argument 2 is null but the corresponding size argument 3 value is 4095 [-Werror=nonnull]
119 | return __glibc_fortify (readlink, __len, sizeof (char),
| ^~~~~~~~~~~~~~~
This error implies the allocated buffer can be NULL. Use
g_file_read_link(), which allocates buffer automatically to avoid the
error.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
| -rw-r--r-- | util/vfio-helpers.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c index 2d8af38..f8bab46 100644 --- a/util/vfio-helpers.c +++ b/util/vfio-helpers.c @@ -106,15 +106,17 @@ struct QEMUVFIOState { */ static char *sysfs_find_group_file(const char *device, Error **errp) { + g_autoptr(GError) gerr = NULL; char *sysfs_link; char *sysfs_group; char *p; char *path = NULL; sysfs_link = g_strdup_printf("/sys/bus/pci/devices/%s/iommu_group", device); - sysfs_group = g_malloc0(PATH_MAX); - if (readlink(sysfs_link, sysfs_group, PATH_MAX - 1) == -1) { - error_setg_errno(errp, errno, "Failed to find iommu group sysfs path"); + sysfs_group = g_file_read_link(sysfs_link, &gerr); + if (gerr) { + error_setg(errp, "Failed to find iommu group sysfs path: %s", + gerr->message); goto out; } p = strrchr(sysfs_group, '/'); |