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| author | Miklos Szeredi <mszeredi@redhat.com> | 2021-08-04 13:22:58 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-22 12:28:00 +0200 |
| commit | b7d4f310bb8f605cff7c4c70014a9e2b866625c4 (patch) | |
| tree | 527a68dd27a3edd7badc61ea83dd7306132e130f /drivers/pci/controller/dwc/pcie-tegra194.c | |
| parent | 03cc3a2923d62f847d148f545c711f73f79617f0 (diff) | |
| download | kernel_replicant_linux-b7d4f310bb8f605cff7c4c70014a9e2b866625c4.tar.gz kernel_replicant_linux-b7d4f310bb8f605cff7c4c70014a9e2b866625c4.tar.bz2 kernel_replicant_linux-b7d4f310bb8f605cff7c4c70014a9e2b866625c4.zip | |
fuse: fix use after free in fuse_read_interrupt()
[ Upstream commit e1e71c168813564be0f6ea3d6740a059ca42d177 ]
There is a potential race between fuse_read_interrupt() and
fuse_request_end().
TASK1
in fuse_read_interrupt(): delete req->intr_entry (while holding
fiq->lock)
TASK2
in fuse_request_end(): req->intr_entry is empty -> skip fiq->lock
wake up TASK3
TASK3
request is freed
TASK1
in fuse_read_interrupt(): dereference req->in.h.unique ***BAM***
Fix by always grabbing fiq->lock if the request was ever interrupted
(FR_INTERRUPTED set) thereby serializing with concurrent
fuse_read_interrupt() calls.
FR_INTERRUPTED is set before the request is queued on fiq->interrupts.
Dequeing the request is done with list_del_init() but FR_INTERRUPTED is not
cleared in this case.
Reported-by: lijiazi <lijiazi@xiaomi.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/pci/controller/dwc/pcie-tegra194.c')
0 files changed, 0 insertions, 0 deletions