Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: ch9200: fix uninitialised access during mii_nway_restart In mii_nway_restart() the code attempts to call mii->mdio_read which is ch9200_mdio_read(). ch9200_mdio_read() utilises a local buffer called "buff", which is initialised with control_read(). However "buff" is conditionally initialised inside control_read(): if (err == size) { memcpy(data, buf, size); } If the condition of "err == size" is not met, then "buff" remains uninitialised. Once this happens the uninitialised "buff" is accessed and returned during ch9200_mdio_read(): return (buff[0] | buff[1] << 8); The problem stems from the fact that ch9200_mdio_read() ignores the return value of control_read(), leading to uinit-access of "buff". To fix this we should check the return value of control_read() and return early on error.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 4a476bd6d1d923922ec950ddc4c27b279f6901eb before 119766de4930ff40db9f36b960cb53b0c400e81b; affected 4a476bd6d1d923922ec950ddc4c27b279f6901eb before 33163c68d2e3061fa3935b5f0a1867958b1cdbd2; affected 4a476bd6d1d923922ec950ddc4c27b279f6901eb before 9da3e442714f7f4393ff01c265c4959c03e88c2f; affected 4a476bd6d1d923922ec950ddc4c27b279f6901eb before 9a350f30d65197354706b7759b5c89d6c267b1a9; affected 4a476bd6d1d923922ec950ddc4c27b279f6901eb before 6bd2569d0b2f918e9581f744df0263caf73ee76c; affected 4a476bd6d1d923922ec950ddc4c27b279f6901eb before 4da7fcc098218ff92b2e83a43f545c02f714cedd; affected 4a476bd6d1d923922ec950ddc4c27b279f6901eb before cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72; affected 4a476bd6d1d923922ec950ddc4c27b279f6901eb before 9ad0452c0277b816a435433cca601304cfac7c21 |
| Linux / Linux | affected 4.3; unaffected 0 before 4.3; unaffected 5.4.295 through 5.4.*; unaffected 5.10.239 through 5.10.*; unaffected 5.15.186 through 5.15.*; unaffected 6.1.142 through 6.1.*; unaffected 6.6.95 through 6.6.*; unaffected 6.12.35 through 6.12.*; unaffected 6.15.4 through 6.15.*; unaffected 6.16 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/119766de4930ff40db9f36b960cb53b0c400e81b
- https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2
- https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2f
- https://git.kernel.org/stable/c/9a350f30d65197354706b7759b5c89d6c267b1a9
- https://git.kernel.org/stable/c/6bd2569d0b2f918e9581f744df0263caf73ee76c
- https://git.kernel.org/stable/c/4da7fcc098218ff92b2e83a43f545c02f714cedd
- https://git.kernel.org/stable/c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72
- https://git.kernel.org/stable/c/9ad0452c0277b816a435433cca601304cfac7c21
ADP enrichment
No English description supplied.