[xen staging] tools/xenstored: Avoid unnecessary talloc_strdup() in do_lu_start()

[patchbot@xxxxxxx]

commit 702b44be43b431695dd9ab49ca4a89ea50e31711
Author:     Julien Grall <jgrall@xxxxxxxxxx>
AuthorDate: Thu Feb 25 15:43:04 2021 +0000
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Fri Feb 26 09:45:58 2021 +0000

    tools/xenstored: Avoid unnecessary talloc_strdup() in do_lu_start()
    
    At the moment, the return of talloc_strdup() is not checked. This means
    we may dereference a NULL pointer if the allocation failed.
    
    However, it is pointless to allocate the memory as send_reply() will
    copy the data to a different buffer. So drop the use of talloc_strdup().
    
    This bug was discovered and resolved using Coverity Static Analysis
    Security Testing (SAST) by Synopsys, Inc.
    
    Fixes: af216a99fb4a ("tools/xenstore: add the basic framework for doing the 
live update")
    Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
    Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
    Release-Acked-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
---
 tools/xenstore/xenstored_control.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tools/xenstore/xenstored_control.c 
b/tools/xenstore/xenstored_control.c
index e8a501acdb..8eb5782776 100644
--- a/tools/xenstore/xenstored_control.c
+++ b/tools/xenstore/xenstored_control.c
@@ -638,7 +638,6 @@ static bool do_lu_start(struct delayed_request *req)
 {
        time_t now = time(NULL);
        const char *ret;
-       char *resp;
 
        if (!lu_check_lu_allowed()) {
                if (now < lu_status->started_at + lu_status->timeout)
@@ -660,8 +659,7 @@ static bool do_lu_start(struct delayed_request *req)
  out:
        talloc_free(lu_status);
 
-       resp = talloc_strdup(req->in, ret);
-       send_reply(lu_status->conn, XS_CONTROL, resp, strlen(resp) + 1);
+       send_reply(lu_status->conn, XS_CONTROL, ret, strlen(ret) + 1);
 
        return true;
 }
--
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