n the Linux kernel, the following vulnerability has been resolved: net: hso: fix null-ptr-deref during tty device unregistration Multiple ttys try to claim the same the minor number causing a double unregistration of the same device. The first unregistration succeeds but the next one results in a null-ptr-deref. The get_free_serial_index() function returns an available minor number but doesn't assign it immediately. The assignment is done by the caller later. But before this assignment, calls to get_free_serial_index() would return the same minor number. Fix this by modifying get_free_serial_index to assign the minor number immediately after one is found to be and rename it to obtain_minor() to better reflect what it does. Similary, rename set_serial_by_index() to release_minor() and modify it to free up the minor number of the given hso_serial. Every obtain_minor() should have corresponding release_minor() call.
Configuration 1 (hide)
|
21 Nov 2024, 06:34
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/145c89c441d27696961752bf51b323f347601bee - Patch | |
| References | () https://git.kernel.org/stable/c/388d05f70f1ee0cac4a2068fd295072f1a44152a - Patch | |
| References | () https://git.kernel.org/stable/c/4a2933c88399c0ebc738db39bbce3ae89786d723 - Patch | |
| References | () https://git.kernel.org/stable/c/8a12f8836145ffe37e9c8733dce18c22fb668b66 - Patch | |
| References | () https://git.kernel.org/stable/c/92028d7a31e55d53e41cff679156b9432cffcb36 - Patch | |
| References | () https://git.kernel.org/stable/c/a462067d7c8e6953a733bf5ade8db947b1bb5449 - Patch | |
| References | () https://git.kernel.org/stable/c/caf5ac93b3b5d5fac032fc11fbea680e115421b4 - Patch | |
| References | () https://git.kernel.org/stable/c/dc195928d7e4ec7b5cfc6cd10dc4c8d87a7c72ac - Patch |
Published : 2024-02-26 16:27
Updated : 2024-11-21 06:34
NVD link : CVE-2021-46904
Mitre link : CVE-2021-46904
CVE.ORG link : CVE-2021-46904
JSON object : View
NULL Pointer Dereference