Description
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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
fbb0de795078190a9834b3409e4b009cfb18a6d4 to < 5d50f851dd307c07ca5591297093f19967c834a9affectedfbb0de795078190a9834b3409e4b009cfb18a6d4 to < b267a8118c2b171bf7d67b90ed64154eeab9fae0affectedfbb0de795078190a9834b3409e4b009cfb18a6d4 to < 811b667cefbea9cb7511a874b169d6a92907137eaffectedfbb0de795078190a9834b3409e4b009cfb18a6d4 to < a3728d32fc61eb0fe283cb8ff60b2c8f751e2202affectedfbb0de795078190a9834b3409e4b009cfb18a6d4 to < 9e9b4a269f84d3230f2af84ff42322db676440d9affectedfbb0de795078190a9834b3409e4b009cfb18a6d4 to < 2b6dd600dd72573c23ea180b5b0b2f1813405882affected
Linux Linux
Default version status: affected
4.20affected0 to < 4.20unaffected5.4.189 to ≤ 5.4.*unaffected5.10.110 to ≤ 5.10.*unaffected5.15.33 to ≤ 5.15.*unaffected5.16.19 to ≤ 5.16.*unaffected5.17.2 to ≤ 5.17.*unaffected5.18 to ≤ *unaffected
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 ↗