[Pkg-samba-maint] [samba] 10/26: CVE-2013-4408:async_sock: add some overflow detection to read_packet_handler()

[Ivo De Decker]

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idd-guest pushed a commit to branch samba_4.1
in repository samba.

commit 0ba0b27176b2caccf7e708e60acec14d17469125
Author: Stefan Metzmacher <metze at samba.org>
Date:   Wed Oct 16 14:17:49 2013 +0200

    CVE-2013-4408:async_sock: add some overflow detection to read_packet_handler()
    
    Bug: https://bugzilla.samba.org/show_bug.cgi?id=10185
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Jeremy Allison <jra at samba.org>
---
 lib/async_req/async_sock.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/async_req/async_sock.c b/lib/async_req/async_sock.c
index 59dde88..74b2cb7 100644
--- a/lib/async_req/async_sock.c
+++ b/lib/async_req/async_sock.c
@@ -667,6 +667,11 @@ static void read_packet_handler(struct tevent_context *ev,
 		return;
 	}
 
+	if (total + more < total) {
+		tevent_req_error(req, EMSGSIZE);
+		return;
+	}
+
 	tmp = talloc_realloc(state, state->buf, uint8_t, total+more);
 	if (tevent_req_nomem(tmp, req)) {
 		return;

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