Description

In the Linux kernel, the following vulnerability has been resolved: media: dvb-usb-v2: gl861: Fix null-ptr-deref in gl861_i2c_master_xfer In gl861_i2c_master_xfer, msg is controlled by user. When msg[i].buf is null and msg[i].len is zero, former checks on msg[i].buf would be passed. Malicious data finally reach gl861_i2c_master_xfer. If accessing msg[i].buf[0] without sanity check, null ptr deref would happen. We add check on msg[i].len to prevent crash. Similar commit: commit 0ed554fd769a ("media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()")

References 5

• git.kernel.org https://git.kernel.org/stable/c/2a33fc57133d6f39d62285df6706aeb1714967f1
• git.kernel.org https://git.kernel.org/stable/c/578b67614ae0e4fba3945b66a4c8f9ae77115bcb
• git.kernel.org https://git.kernel.org/stable/c/72af676551efe820e309a6c7681c2c4372f37376
• git.kernel.org https://git.kernel.org/stable/c/b97719a66970601cd3151a3e2020f4454a1c4ff6
• git.kernel.org https://git.kernel.org/stable/c/dfcd3c010209927b9f45b860f046635dc32e32e1

Remediation