Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: libnvdimm/labels: Fix divide error in nd_label_data_init() If a faulty CXL memory device returns a broken zero LSA size in its memory device information (Identify Memory Device (Opcode 4000h), CXL spec. 3.1, 8.2.9.9.1.1), a divide error occurs in the libnvdimm driver: Oops: divide error: 0000 [#1] PREEMPT SMP NOPTI RIP: 0010:nd_label_data_init+0x10e/0x800 [libnvdimm] Code and flow: 1) CXL Command 4000h returns LSA size = 0 2) config_size is assigned to zero LSA size (CXL pmem driver): drivers/cxl/pmem.c: .config_size = mds->lsa_size, 3) max_xfer is set to zero (nvdimm driver): drivers/nvdimm/label.c: max_xfer = min_t(size_t, ndd->nsarea.max_xfer, config_size); 4) A subsequent DIV_ROUND_UP() causes a division by zero: drivers/nvdimm/label.c: /* Make our initial read size a multiple of max_xfer size */ drivers/nvdimm/label.c: read_size = min(DIV_ROUND_UP(read_size, max_xfer) * max_xfer, drivers/nvdimm/label.c- config_size); Fix this by checking the config size parameter by extending an existing check.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 7d47aad4570e5e6e9a8162bb417ca9b74132f27c before 2bd4a938d2eda96ab7288b8fa5aae84a1de8c4ca; affected 7d47aad4570e5e6e9a8162bb417ca9b74132f27c before 396c46d3f59a18ebcc500640e749f16e197d472b; affected 7d47aad4570e5e6e9a8162bb417ca9b74132f27c before f49c337037df029440a8390380dd35d2cf5924d3; affected 7d47aad4570e5e6e9a8162bb417ca9b74132f27c before db1aef51b8e66a77f76b1250b914589c31a0a0ed; affected 7d47aad4570e5e6e9a8162bb417ca9b74132f27c before ea3d95e05e97ea20fd6513f647393add16fce3b2; affected 7d47aad4570e5e6e9a8162bb417ca9b74132f27c before 1d1e1efad1cf049e888bf175a5c6be85d792620c; affected 7d47aad4570e5e6e9a8162bb417ca9b74132f27c before e14347f647ca6d76fe1509b6703e340f2d5e2716; affected 7d47aad4570e5e6e9a8162bb417ca9b74132f27c before ef1d3455bbc1922f94a91ed58d3d7db440652959 |
| Linux / Linux | affected 4.20; unaffected 0 before 4.20; unaffected 5.4.294 through 5.4.*; unaffected 5.10.238 through 5.10.*; unaffected 5.15.185 through 5.15.*; unaffected 6.1.141 through 6.1.*; unaffected 6.6.93 through 6.6.*; unaffected 6.12.31 through 6.12.*; unaffected 6.14.9 through 6.14.*; unaffected 6.15 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/2bd4a938d2eda96ab7288b8fa5aae84a1de8c4ca
- https://git.kernel.org/stable/c/396c46d3f59a18ebcc500640e749f16e197d472b
- https://git.kernel.org/stable/c/f49c337037df029440a8390380dd35d2cf5924d3
- https://git.kernel.org/stable/c/db1aef51b8e66a77f76b1250b914589c31a0a0ed
- https://git.kernel.org/stable/c/ea3d95e05e97ea20fd6513f647393add16fce3b2
- https://git.kernel.org/stable/c/1d1e1efad1cf049e888bf175a5c6be85d792620c
- https://git.kernel.org/stable/c/e14347f647ca6d76fe1509b6703e340f2d5e2716
- https://git.kernel.org/stable/c/ef1d3455bbc1922f94a91ed58d3d7db440652959
ADP enrichment
No English description supplied.