Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: udmabuf: validate ubuf->pagecount Syzbot has reported GPF in sg_alloc_append_table_from_pages(). The problem was in ubuf->pages == ZERO_PTR. ubuf->pagecount is calculated from arguments passed from user-space. If user creates udmabuf with list.size == 0 then ubuf->pagecount will be also equal to zero; it causes kmalloc_array() to return ZERO_PTR. Fix it by validating ubuf->pagecount before passing it to kmalloc_array().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected fbb0de795078190a9834b3409e4b009cfb18a6d4 before 5d50f851dd307c07ca5591297093f19967c834a9; affected fbb0de795078190a9834b3409e4b009cfb18a6d4 before b267a8118c2b171bf7d67b90ed64154eeab9fae0; affected fbb0de795078190a9834b3409e4b009cfb18a6d4 before 811b667cefbea9cb7511a874b169d6a92907137e; affected fbb0de795078190a9834b3409e4b009cfb18a6d4 before a3728d32fc61eb0fe283cb8ff60b2c8f751e2202; affected fbb0de795078190a9834b3409e4b009cfb18a6d4 before 9e9b4a269f84d3230f2af84ff42322db676440d9; affected fbb0de795078190a9834b3409e4b009cfb18a6d4 before 2b6dd600dd72573c23ea180b5b0b2f1813405882 |
| Linux / Linux | affected 4.20; unaffected 0 before 4.20; unaffected 5.4.189 through 5.4.*; unaffected 5.10.110 through 5.10.*; unaffected 5.15.33 through 5.15.*; unaffected 5.16.19 through 5.16.*; unaffected 5.17.2 through 5.17.*; unaffected 5.18 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/5d50f851dd307c07ca5591297093f19967c834a9
- https://git.kernel.org/stable/c/b267a8118c2b171bf7d67b90ed64154eeab9fae0
- https://git.kernel.org/stable/c/811b667cefbea9cb7511a874b169d6a92907137e
- https://git.kernel.org/stable/c/a3728d32fc61eb0fe283cb8ff60b2c8f751e2202
- https://git.kernel.org/stable/c/9e9b4a269f84d3230f2af84ff42322db676440d9
- https://git.kernel.org/stable/c/2b6dd600dd72573c23ea180b5b0b2f1813405882