Description
In the Linux kernel, the following vulnerability has been resolved: module: decompress: check return value of module_extend_max_pages() module_extend_max_pages() calls kvrealloc() internally and returns -ENOMEM on allocation failure. The return value is never checked. If the initial allocation fails, info->pages remains NULL and info->max_pages remains 0. Subsequent calls to module_get_next_page() will attempt to dynamically grow the array by calling module_extend_max_pages(info, 0) since info->used_pages is 0. This results in kvrealloc(NULL, 0) returning ZERO_SIZE_PTR, which is treated as a success, leading to a dereference of ZERO_SIZE_PTR and a kernel oops. Fix: add the missing error check after module_extend_max_pages() and return immediately on failure. This matches the pattern used by every other kvrealloc() caller in the module loading path. [Sami: Corrected the analysis in the commit message.]
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
b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 to < e7f174715f9f0cbcb9e87b52e4fc4ef149baac98affectedb1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 to < afcc0515bbdd28d509a2b5870faaa89b137f5d53affectedb1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 to < 168072baf9ad516d5a06046514c7fea4c0671990affectedb1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 to < a82e170637e050a803b4f37542371ef216bf66d2affectedb1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 to < e7da02659c229f73492fb1ed87ceda4090153aaaaffectedb1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 to < 786d2d84416a9a1c1a47b71a68d679d886284be2affected
Linux Linux
Default version status: affected
5.17affected0 to < 5.17unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.96 to ≤ 6.12.*unaffected6.18.39 to ≤ 6.18.*unaffected7.1.4 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/e7f174715f9f0cbcb9e87b52e4fc4ef149baac98 ↗
- https://git.kernel.org/stable/c/afcc0515bbdd28d509a2b5870faaa89b137f5d53 ↗
- https://git.kernel.org/stable/c/168072baf9ad516d5a06046514c7fea4c0671990 ↗
- https://git.kernel.org/stable/c/a82e170637e050a803b4f37542371ef216bf66d2 ↗
- https://git.kernel.org/stable/c/e7da02659c229f73492fb1ed87ceda4090153aaa ↗
- https://git.kernel.org/stable/c/786d2d84416a9a1c1a47b71a68d679d886284be2 ↗