Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix uninitialized return value in netfs_unbuffered_write() If preparation of the first subrequest fails, netfs_unbuffered_write() exits its loop before ret is initialized. The empty-iterator check can do the same. For synchronous writes, netfs_unbuffered_write_iter_locked() may then return an unrelated error instead of wreq->error. This is reachable through CIFS if cifs_prepare_write() fails to reopen the file or obtain credits. Initialize ret to 0 so the caller returns wreq->error if no data was written, or the number of bytes already written otherwise. Found with Clang's -Wconditional-uninitialized.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 72d08d2839649d1c5efbe375751f4473fa4486af before 3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26; affected a0b4c7a49137ed21279f354eb59f49ddae8dffc2 before 2e38d500471d097cda87d7d374bbc1b13493075d; affected a0b4c7a49137ed21279f354eb59f49ddae8dffc2 before f18e8774f4d3137fa0a5fb8ffa83d59a719666d8; affected 0c29f6d63122a0168d67cb8ecde5b4cf7fe4acb0; affected 6.18.17 before 6.18.53; affected 6.19.7 before 6.20 |
| Linux / Linux | affected 7.0; unaffected 0 before 7.0; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.