Description
In the Linux kernel, the following vulnerability has been resolved: io_uring/net: fix overflow check in io_recvmsg_mshot_prep() The "controllen" variable is type size_t (unsigned long). Casting it to int could lead to an integer underflow. The check_add_overflow() function considers the type of the destination which is type int. If we add two positive values and the result cannot fit in an integer then that's counted as an overflow. However, if we cast "controllen" to an int and it turns negative, then negative values *can* fit into an int type so there is no overflow. Good: 100 + (unsigned long)-4 = 96 <-- overflow Bad: 100 + (int)-4 = 96 <-- no overflow I deleted the cast of the sizeof() as well. That's not a bug but the cast is unnecessary.
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
9b0fc3c054ff2eb13753104884f1045b5bb3a627 to < 868ec868616438df487b9e2baa5a99f8662cc47caffected9b0fc3c054ff2eb13753104884f1045b5bb3a627 to < 59a534690ecc3af72c6ab121aeac1237a4adae66affected9b0fc3c054ff2eb13753104884f1045b5bb3a627 to < 0c8c74bb59e7d77554016efc34c2d10376985e5eaffected9b0fc3c054ff2eb13753104884f1045b5bb3a627 to < b6563ad0d599110bd5cf8f56c47d279c3ed796feaffected9b0fc3c054ff2eb13753104884f1045b5bb3a627 to < 8ede3db5061bb1fe28e2c9683329aafa89d2b1b4affected
Linux Linux
Default version status: affected
6.0affected0 to < 6.0unaffected6.1.83 to ≤ 6.1.*unaffected6.6.23 to ≤ 6.6.*unaffected6.7.11 to ≤ 6.7.*unaffected6.8.2 to ≤ 6.8.*unaffected6.9 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/868ec868616438df487b9e2baa5a99f8662cc47c ↗
- https://git.kernel.org/stable/c/59a534690ecc3af72c6ab121aeac1237a4adae66 ↗
- https://git.kernel.org/stable/c/0c8c74bb59e7d77554016efc34c2d10376985e5e ↗
- https://git.kernel.org/stable/c/b6563ad0d599110bd5cf8f56c47d279c3ed796fe ↗
- https://git.kernel.org/stable/c/8ede3db5061bb1fe28e2c9683329aafa89d2b1b4 ↗