Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ALSA: oss: Fix PCM OSS buffer allocation overflow We've got syzbot reports hitting INT_MAX overflow at vmalloc() allocation that is called from snd_pcm_plug_alloc(). Although we apply the restrictions to input parameters, it's based only on the hw_params of the underlying PCM device. Since the PCM OSS layer allocates a temporary buffer for the data conversion, the size may become unexpectedly large when more channels or higher rates is given; in the reported case, it went over INT_MAX, hence it hits WARN_ON(). This patch is an attempt to avoid such an overflow and an allocation for too large buffers. First off, it adds the limit of 1MB as the upper bound for period bytes. This must be large enough for all use cases, and we really don't want to handle a larger temporary buffer than this size. The size check is performed at two places, where the original period bytes is calculated and where the plugin buffer size is calculated. In addition, the driver uses array_size() and array3_size() for multiplications to catch overflows for the converted period size and buffer bytes.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a63af1baf0a5e11827db60e3127f87e437cab6e5; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 0c4190b41a69990666b4000999e27f8f1b2a426b; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 5ce74ff7059341d8b2f4d01c3383491df63d1898; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 7a40cbf3579a8e14849ba7ce46309c1992658d2b; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before fb08bf99195a87c798bc8ae1357337a981faeade; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before e74a069c6a7bb505f3ade141dddf85f4b0b5145a; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before efb6402c3c4a7c26d97c92d70186424097b6e366 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 4.19.237 through 4.19.*; unaffected 5.4.188 through 5.4.*; unaffected 5.10.109 through 5.10.*; unaffected 5.15.32 through 5.15.*; unaffected 5.16.18 through 5.16.*; unaffected 5.17.1 through 5.17.*; unaffected 5.18 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/a63af1baf0a5e11827db60e3127f87e437cab6e5
- https://git.kernel.org/stable/c/0c4190b41a69990666b4000999e27f8f1b2a426b
- https://git.kernel.org/stable/c/5ce74ff7059341d8b2f4d01c3383491df63d1898
- https://git.kernel.org/stable/c/7a40cbf3579a8e14849ba7ce46309c1992658d2b
- https://git.kernel.org/stable/c/fb08bf99195a87c798bc8ae1357337a981faeade
- https://git.kernel.org/stable/c/e74a069c6a7bb505f3ade141dddf85f4b0b5145a
- https://git.kernel.org/stable/c/efb6402c3c4a7c26d97c92d70186424097b6e366