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{
    "id": 2224700,
    "url": "http://patchwork.ozlabs.org/api/patches/2224700/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260417192036.268452-1-tristan@talencesecurity.com/",
    "project": {
        "id": 12,
        "url": "http://patchwork.ozlabs.org/api/projects/12/?format=api",
        "name": "Linux CIFS Client",
        "link_name": "linux-cifs-client",
        "list_id": "linux-cifs.vger.kernel.org",
        "list_email": "linux-cifs@vger.kernel.org",
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    "msgid": "<20260417192036.268452-1-tristan@talencesecurity.com>",
    "list_archive_url": null,
    "date": "2026-04-17T19:20:36",
    "name": "ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "62bcdf4a5c9a4e287de0100d527313a75170b11b",
    "submitter": {
        "id": 93179,
        "url": "http://patchwork.ozlabs.org/api/people/93179/?format=api",
        "name": "Tristan Madani",
        "email": "tristmd@gmail.com"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260417192036.268452-1-tristan@talencesecurity.com/mbox/",
    "series": [
        {
            "id": 500392,
            "url": "http://patchwork.ozlabs.org/api/series/500392/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=500392",
            "date": "2026-04-17T19:20:36",
            "name": "ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/500392/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2224700/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2224700/checks/",
    "tags": {},
    "related": [],
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        "From": "Tristan Madani <tristmd@gmail.com>",
        "X-Google-Original-From": "Tristan Madani <tristan@talencesecurity.com>",
        "To": "Namjae Jeon <linkinjeon@kernel.org>,\n\tSteve French <smfrench@gmail.com>",
        "Cc": "Sergey Senozhatsky <senozhatsky@chromium.org>,\n\tTom Talpey <tom@talpey.com>,\n\tlinux-cifs@vger.kernel.org,\n\tstable@vger.kernel.org,\n\tTristan Madani <tristan@talencesecurity.com>",
        "Subject": "[PATCH] ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment",
        "Date": "Fri, 17 Apr 2026 19:20:36 +0000",
        "Message-ID": "<20260417192036.268452-1-tristan@talencesecurity.com>",
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    "content": "smb2_get_ea() applies 4-byte alignment padding via memset() after\nwriting each EA entry. The bounds check for buf_free_len is performed\nbefore the value memcpy, but the alignment memset fires unconditionally\nafterward with no check. When the EA value exactly fills the remaining\nbuffer space (buf_free_len == 0 after value subtraction), the alignment\nmemset writes 1-3 NUL bytes past the buf_free_len boundary.\n\nAdd a bounds check before the alignment memset to prevent writing past\nthe authorized buffer space.\n\nThis is the same bug pattern as commit beef2634f81f (\"ksmbd: fix\nout-of-bounds write in get_file_all_info() for compound requests\")\nand commit fda9522ed6af (\"ksmbd: fix out-of-bounds write in\nksmbd_vfs_get_sd_xattr() for compound requests\"), both of which\nadded bounds checks before unconditional writes in QUERY_INFO\nresponse formatting.\n\nCc: stable@vger.kernel.org\nSigned-off-by: Tristan Madani <tristan@talencesecurity.com>\n---\n fs/smb/server/smb2pdu.c | 2 ++\n 1 file changed, 2 insertions(+)",
    "diff": "diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c\nindex ee32e61b6d3c7..407173d2175af 100644\n--- a/fs/smb/server/smb2pdu.c\n+++ b/fs/smb/server/smb2pdu.c\n@@ -4821,6 +4821,8 @@ static int smb2_get_ea(struct ksmbd_work *work, struct ksmbd_file *fp,\n \t\t/* align next xattr entry at 4 byte bundary */\n \t\talignment_bytes = ((next_offset + 3) & ~3) - next_offset;\n \t\tif (alignment_bytes) {\n+\t\t\tif (buf_free_len < alignment_bytes)\n+\t\t\t\tbreak;\n \t\t\tmemset(ptr, '\\0', alignment_bytes);\n \t\t\tptr += alignment_bytes;\n \t\t\tnext_offset += alignment_bytes;\n",
    "prefixes": []
}