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

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commit 860ca5e50f73c2a1cef7eefc9d39d04e275417f7 upstream.

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: eec04ea11969 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Haoxiang Li 2025-02-17 15:20:38 +08:00 committed by Greg Kroah-Hartman
parent 5801ed1c0b
commit 24e8e4523d
1 changed files with 4 additions and 0 deletions
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4
fs/smb/client/smb2ops.c
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@ -5158,6 +5158,10 @@ 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);
}