CVE-2024-49996
cifs: Fix buffer overflow when parsing NFS reparse points
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cifs: Fix buffer overflow when parsing NFS reparse points
In the Linux kernel, the following vulnerability has been resolved: cifs: Fix buffer overflow when parsing NFS reparse points ReparseDataLength is sum of the InodeType size and DataBuffer size. So to get DataBuffer size it is needed to subtract InodeType's size from ReparseDataLength. Function cifs_strndup_from_utf16() is currentlly accessing buf->DataBuffer at position after the end of the buffer because it does not subtract InodeType size from the length. Fix this problem and correctly subtract variable len. Member InodeType is present only when reparse buffer is large enough. Check for ReparseDataLength before accessing InodeType to prevent another invalid memory access. Major and minor rdev values are present also only when reparse buffer is large enough. Check for reparse buffer size before calling reparse_mkdev().
Reserved 2024-10-21 | Published 2024-10-21 | Updated 2025-05-04 | Assigner Linuxgit.kernel.org/...c/7b222d6cb87077faf56a687a72af1951cf78c8a9
git.kernel.org/...c/73b078e3314d4854fd8286f3ba65c860ddd3a3dd
git.kernel.org/...c/01cdddde39b065074fd48f07027757783cbf5b7d
git.kernel.org/...c/ec79e6170bcae8a6036a4b6960f5e7e59a785601
git.kernel.org/...c/c6db81c550cea0c73bd72ef55f579991e0e4ba07
git.kernel.org/...c/803b3a39cb096d8718c0aebc03fd19f11c7dc919
git.kernel.org/...c/c173d47b69f07cd7ca08efb4e458adbd4725d8e9
git.kernel.org/...c/e2a8910af01653c1c268984855629d71fb81f404
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