Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 4d63a25c4523b5d18e5307897d56aff785f43bf5 before f0a06203f2fe63f04311467200c99c4ee1926578; affected 4d63a25c4523b5d18e5307897d56aff785f43bf5 before 6738841f6fcf23e9fc30e2449f32fc84ee19c6f1; affected 4d63a25c4523b5d18e5307897d56aff785f43bf5 before 5b8e5e28e85a546dfccc3895befe0e823fdd7c89; affected 4d63a25c4523b5d18e5307897d56aff785f43bf5 before 47e8b73bc35d7c54642f78e498697692f6358996 |
| Linux / Linux | affected 3.18; unaffected 0 before 3.18; unaffected 5.15.113 through 5.15.*; unaffected 6.1.30 through 6.1.*; unaffected 6.3.4 through 6.3.*; unaffected 6.4 through * |
CWE
No CWE identifiers supplied.