--- /dev/null
+From: The FreeBSD Project
+Bug: https://security-tracker.debian.org/tracker/CVE-2014-9862
+Subject: CVE-2014-9862 - check for a negative value on numbers of bytes
+ The implementation of bspatch does not check for a negative value on numbers
+ of bytes read from the diff and extra streams, allowing an attacker who
+ can control the patch file to write at arbitrary locations in the heap.
+ .
+ bspatch's main loop reads three numbers from the "control" stream in
+ the patch: X, Y and Z. The first two are the number of bytes to read
+ from "diff" and "extra" (and thus only non-negative), while the
+ third one could be positive or negative and moves the oldpos pointer
+ on the source image. These 3 values are 64bits signed ints (encoded
+ somehow on the file) that are later passed the function that reads
+ from the streams, but those values are not verified to be
+ non-negative.
+ .
+ Official report https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9862
+ The patch was downloaded from a link pointed by
+ https://security.freebsd.org/advisories/FreeBSD-SA-16:25.bsp
+
+---
+ bspatch.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+--- a/bspatch.c
++++ b/bspatch.c
+@@ -152,6 +152,10 @@ int main(int argc,char * argv[])
+ };
+
+ /* Sanity-check */
++ if ((ctrl[0] < 0) || (ctrl[1] < 0))
++ errx(1,"Corrupt patch\n");
++
++ /* Sanity-check */
+ if(newpos+ctrl[0]>newsize)
+ errx(1,"Corrupt patch\n");
+