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| author | Gao Xiang <hsiangkao@linux.alibaba.com> | 2023-03-05 16:44:55 +0300 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2023-03-09 17:49:57 +0300 |
| commit | 8f121dfb15f7b4ab345992ce96003eb63fd608f4 (patch) | |
| tree | ff2548abbdaad399d0b35eec9c700d4ded0719a6 /fs/erofs/decompressor_lzma.c | |
| parent | a279adedbb5206ccadb6b2817838cbb1c834133d (diff) | |
| download | linux-8f121dfb15f7b4ab345992ce96003eb63fd608f4.tar.xz | |
erofs: fix wrong kunmap when using LZMA on HIGHMEM platforms
As the call trace shown, the root cause is kunmap incorrect pages:
BUG: kernel NULL pointer dereference, address: 00000000
CPU: 1 PID: 40 Comm: kworker/u5:0 Not tainted 6.2.0-rc5 #4
Workqueue: erofs_worker z_erofs_decompressqueue_work
EIP: z_erofs_lzma_decompress+0x34b/0x8ac
z_erofs_decompress+0x12/0x14
z_erofs_decompress_queue+0x7e7/0xb1c
z_erofs_decompressqueue_work+0x32/0x60
process_one_work+0x24b/0x4d8
? process_one_work+0x1a4/0x4d8
worker_thread+0x14c/0x3fc
kthread+0xe6/0x10c
? rescuer_thread+0x358/0x358
? kthread_complete_and_exit+0x18/0x18
ret_from_fork+0x1c/0x28
---[ end trace 0000000000000000 ]---
The bug is trivial and should be fixed now. It has no impact on
!HIGHMEM platforms.
Fixes: 622ceaddb764 ("erofs: lzma compression support")
Cc: <stable@vger.kernel.org> # 5.16+
Reviewed-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230305134455.88236-1-hsiangkao@linux.alibaba.com
Diffstat (limited to 'fs/erofs/decompressor_lzma.c')
| -rw-r--r-- | fs/erofs/decompressor_lzma.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/erofs/decompressor_lzma.c b/fs/erofs/decompressor_lzma.c index 307b37f0b9f5..d38e19c11270 100644 --- a/fs/erofs/decompressor_lzma.c +++ b/fs/erofs/decompressor_lzma.c @@ -278,7 +278,7 @@ again: } } if (no < nrpages_out && strm->buf.out) - kunmap(rq->in[no]); + kunmap(rq->out[no]); if (ni < nrpages_in) kunmap(rq->in[ni]); /* 4. push back LZMA stream context to the global list */ |