media: uvcvideo: Fix 1-byte out-of-bounds read in uvc_parse_format()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: media: uvcvideo: Fix 1-byte out-of-bounds read in uvc_parse_format() The buffer length check before calling uvc_parse_format() only ensured that the buffer has at least 3 bytes (buflen > 2), buf the function accesses buffer[3], requiring at least 4 bytes. This can lead to an out-of-bounds read if the buffer has exactly 3 bytes. Fix it by checking that the buffer has at least 4 bytes in uvc_parse_format().

References

• https://git.kernel.org/stable/c/9ad554217c9b945031c73df4e8176a475e2dea57
• https://git.kernel.org/stable/c/1e269581b3aa5962fdc52757ab40da286168c087
• https://git.kernel.org/stable/c/8343f3fe0b755925f83d60b05e92bf4396879758
• https://git.kernel.org/stable/c/ffdd82182953df643aa63d999b6f1653d0c93778
• https://git.kernel.org/stable/c/a97e062e4ff3dab84a2f1eb811e9eddc6699e2a9
• https://git.kernel.org/stable/c/cac702a439050df65272c49184aef7975fe3eff2
• https://git.kernel.org/stable/c/424980d33b3f816485513e538610168b03fab9f1
• https://git.kernel.org/stable/c/6d4a7c0b296162354b6fc759a1475b9d57ddfaa6
• https://git.kernel.org/stable/c/782b6a718651eda3478b1824b37a8b3185d2740c