Revision 7ff57e98fb78ad94edafbdc7435f2d745e9e6bb5 authored by Fabio M. De Francesco on 23 February 2022, 10:02:52 UTC, committed by Jakub Kicinski on 24 February 2022, 17:09:33 UTC
smc_pnetid_by_table_ib() uses read_lock() and then it calls smc_pnet_apply_ib()
which, in turn, calls mutex_lock(&smc_ib_devices.mutex).
read_lock() disables preemption. Therefore, the code acquires a mutex while in
atomic context and it leads to a SAC bug.
Fix this bug by replacing the rwlock with a mutex.
Reported-and-tested-by: syzbot+4f322a6d84e991c38775@syzkaller.appspotmail.com
Fixes: 64e28b52c7a6 ("net/smc: add pnet table namespace support")
Confirmed-by: Tony Lu <tonylu@linux.alibaba.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Acked-by: Karsten Graul <kgraul@linux.ibm.com>
Link: https://lore.kernel.org/r/20220223100252.22562-1-fmdefrancesco@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1 parent e13ad14
| File | Mode | Size |
|---|---|---|
| amdgpu | ||
| bridge | ||
| dp-mst | ||
| rfc | ||
| afbc.rst | -rw-r--r-- | 7.3 KB |
| backlight.rst | -rw-r--r-- | 247 bytes |
| driver-uapi.rst | -rw-r--r-- | 122 bytes |
| drivers.rst | -rw-r--r-- | 311 bytes |
| drm-client.rst | -rw-r--r-- | 295 bytes |
| drm-internals.rst | -rw-r--r-- | 7.6 KB |
| drm-kms-helpers.rst | -rw-r--r-- | 11.0 KB |
| drm-kms.rst | -rw-r--r-- | 17.9 KB |
| drm-mm.rst | -rw-r--r-- | 18.1 KB |
| drm-uapi.rst | -rw-r--r-- | 19.7 KB |
| i915.rst | -rw-r--r-- | 21.8 KB |
| index.rst | -rw-r--r-- | 388 bytes |
| introduction.rst | -rw-r--r-- | 5.3 KB |
| kms-properties.csv | -rw-r--r-- | 7.5 KB |
| komeda-kms.rst | -rw-r--r-- | 15.2 KB |
| mcde.rst | -rw-r--r-- | 287 bytes |
| meson.rst | -rw-r--r-- | 1.7 KB |
| msm-crash-dump.rst | -rw-r--r-- | 2.4 KB |
| pl111.rst | -rw-r--r-- | 261 bytes |
| tegra.rst | -rw-r--r-- | 7.2 KB |
| todo.rst | -rw-r--r-- | 25.8 KB |
| tve200.rst | -rw-r--r-- | 204 bytes |
| v3d.rst | -rw-r--r-- | 759 bytes |
| vc4.rst | -rw-r--r-- | 2.1 KB |
| vga-switcheroo.rst | -rw-r--r-- | 1.9 KB |
| vgaarbiter.rst | -rw-r--r-- | 8.0 KB |
| vkms.rst | -rw-r--r-- | 7.2 KB |
| xen-front.rst | -rw-r--r-- | 1010 bytes |
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