CVE-2023-53458
N/A
Summary
In the Linux kernel, the following vulnerability has been resolved:
media: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish()
When the driver calls cx23885_risc_buffer() to prepare the buffer, the function call dma_alloc_coherent may fail, resulting in a empty buffer risc->cpu. Later when we free the buffer or access the buffer, null ptr deref is triggered.
This bug is similar to the following one: https://git.linuxtv.org/media_stage.git/commit/?id=2b064d91440b33fba5b452f2d1b31f13ae911d71.
We believe the bug can be also dynamically triggered from user side. Similarly, we fix this by checking the return value of cx23885_risc_buffer() and the value of risc->cpu before buffer free.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 4d63a25c4523b5d18e5307897d56aff785f43bf5 < f0a06203f2fe63f04311467200c99c4ee1926578 | affected |
| Linux | Linux | 4d63a25c4523b5d18e5307897d56aff785f43bf5 < 6738841f6fcf23e9fc30e2449f32fc84ee19c6f1 | affected |
| Linux | Linux | 4d63a25c4523b5d18e5307897d56aff785f43bf5 < 5b8e5e28e85a546dfccc3895befe0e823fdd7c89 | affected |
| Linux | Linux | 4d63a25c4523b5d18e5307897d56aff785f43bf5 < 47e8b73bc35d7c54642f78e498697692f6358996 | affected |
| Linux | Linux | 3.18 | affected |
| Linux | Linux | 0 < 3.18 | unaffected |
| Linux | Linux | 5.15.113 <= 5.15.* | unaffected |
| Linux | Linux | 6.1.30 <= 6.1.* | unaffected |
| Linux | Linux | 6.3.4 <= 6.3.* | unaffected |
| Linux | Linux | 6.4 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/f0a06203f2fe63f04311467200c99c4ee1926578
- https://git.kernel.org/stable/c/6738841f6fcf23e9fc30e2449f32fc84ee19c6f1
- https://git.kernel.org/stable/c/5b8e5e28e85a546dfccc3895befe0e823fdd7c89
- https://git.kernel.org/stable/c/47e8b73bc35d7c54642f78e498697692f6358996
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