CVE-2024-53222
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2024-53222
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-53222.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2024-53222
- Downstream
- Related
- Published
- 2024-12-27T13:50:12Z
- Modified
- 2025-10-10T02:23:40.130145Z
- Summary
- zram: fix NULL pointer in comp_algorithm_show()
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
zram: fix NULL pointer in compalgorithmshow()
LTP reported a NULL pointer dereference as followed:
CPU: 7 UID: 0 PID: 5995 Comm: cat Kdump: loaded Not tainted 6.12.0-rc6+ #3 Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : _pistrcmp+0x24/0x140 lr : zcompavailableshow+0x60/0x100 [zram] sp : ffff800088b93b90 x29: ffff800088b93b90 x28: 0000000000000001 x27: 0000000000400cc0 x26: 0000000000000ffe x25: ffff80007b3e2388 x24: 0000000000000000 x23: ffff80007b3e2390 x22: ffff0004041a9000 x21: ffff80007b3e2900 x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000000 x10: ffff80007b3e2900 x9 : ffff80007b3cb280 x8 : 0101010101010101 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000040 x4 : 0000000000000000 x3 : 00656c722d6f7a6c x2 : 0000000000000000 x1 : ffff80007b3e2900 x0 : 0000000000000000 Call trace: _pistrcmp+0x24/0x140 compalgorithmshow+0x40/0x70 [zram] devattrshow+0x28/0x80 sysfskfseqshow+0x90/0x140 kernfsseqshow+0x34/0x48 seqreaditer+0x1d4/0x4e8 kernfsfopreaditer+0x40/0x58 newsyncread+0x9c/0x168 vfsread+0x1a8/0x1f8 ksysread+0x74/0x108 _arm64sysread+0x24/0x38 invokesyscall+0x50/0x120 el0svccommon.constprop.0+0xc8/0xf0 doel0svc+0x24/0x38 el0svc+0x38/0x138 el0t64synchandler+0xc0/0xc8 el0t64sync+0x188/0x190
The zram->compalgs[ZRAMPRIMARYCOMP] can be NULL in zramadd() if compalgorithmset() has not been called. User can access the zram device by sysfs after deviceadddisk(), so there is a time window to trigger the NULL pointer dereference. Move it ahead deviceadddisk() to make sure when user can access the zram device, it is ready. compalgorithmset() is protected by zram->init_lock in other places and no such problem.
- References
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7ac07a26dea79c3892436bce41cce03dcbd3c4c7Fixedc7ee791e538537b281f60945298796f0a3971bbd
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7ac07a26dea79c3892436bce41cce03dcbd3c4c7Fixed843d366ff19708668d95cda16bb8aba109a93dba
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7ac07a26dea79c3892436bce41cce03dcbd3c4c7Fixedf364cdeb38938f9d03061682b8ff3779dd1730e5