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base repository: qemu/qemu
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  • 3 commits
  • 2 files changed
  • 3 contributors

Commits on May 24, 2023

  1. vfio/pci: Fix a use-after-free issue 

    vbasedev->name is freed wrongly which leads to garbage VFIO trace log.
Fix it by allocating a dup of vbasedev->name and then free the dup.

Fixes: 2dca1b3 ("vfio/pci: add support for VF token")
Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
    @duanzhenzhong @legoater
    duanzhenzhong authored and legoater committed May 24, 2023
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  2. 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>
    @akihikodaki @legoater
    akihikodaki authored and legoater committed May 24, 2023
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  3. Merge tag 'pull-vfio-20230524' of https://github.com/legoater/qemu in… 

    …to staging

vfio queue:

* Fix for a memory corruption due to an extra free
* Fix for a compile breakage

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* tag 'pull-vfio-20230524' of https://github.com/legoater/qemu:
  util/vfio-helpers: Use g_file_read_link()
  vfio/pci: Fix a use-after-free issue

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
    @rth7680
    rth7680 committed May 24, 2023
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