CVE-2021-47483
See a problem?- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47483
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47483.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-47483
- Related
- Published
- 2024-05-22T09:15:10Z
- Modified
- 2024-09-18T03:17:29.006293Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
regmap: Fix possible double-free in regcacherbtreeexit()
In regcacherbtreeinserttoblock(), when 'present' realloc failed, the 'blk' which is supposed to assign to 'rbnode->block' will be freed, so 'rbnode->block' points a freed memory, in the error handling path of regcacherbtreeinit(), 'rbnode->block' will be freed again in regcacherbtreeexit(), KASAN will report double-free as follows:
BUG: KASAN: double-free or invalid-free in kfree+0xce/0x390 Call Trace: slabfreefreelisthook+0x10d/0x240 kfree+0xce/0x390 regcacherbtreeexit+0x15d/0x1a0 regcacherbtreeinit+0x224/0x2c0 regcacheinit+0x88d/0x1310 _regmapinit+0x3151/0x4a80 _devmregmapinit+0x7d/0x100 maderaspiprobe+0x10f/0x333 [maderaspi] spiprobe+0x183/0x210 reallyprobe+0x285/0xc30
To fix this, moving up the assignment of rbnode->block to immediately after the reallocation has succeeded so that the data structure stays valid even if the second reallocation fails.
- References
-
- https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f
- https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6
- https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091
- https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047
- https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83
- https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6
- https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999
- https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2
- https://security-tracker.debian.org/tracker/CVE-2021-47483
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source