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smb: client: Add check for next_buffer in receive_encrypted_standard()

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Add check for the return value of cifs_buf_get() and cifs_small_buf_get()
in receive_encrypted_standard() to prevent null pointer dereference.

Fixes: eec04ea119 ("smb: client: fix OOB in receive_encrypted_standard()")
Cc: stable@vger.kernel.org
Signed-off-by: Haoxiang Li <haoxiang_li2024@163.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Haoxiang Li 2025-02-17 15:20:38 +08:00 • committed by Steve French
parent e9a8cac0bf
commit 860ca5e50f
1 changed files with 4 additions and 0 deletions
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4
fs/smb/client/smb2ops.c
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@ -4965,6 +4965,10 @@ one_more:
next_buffer = (char *)cifs_buf_get();
else
next_buffer = (char *)cifs_small_buf_get();
if (!next_buffer) {
cifs_server_dbg(VFS, "No memory for (large) SMB response\n");
return -1;
}
memcpy(next_buffer, buf + next_cmd, pdu_length - next_cmd);
}