** Changed in: linux (Ubuntu Trusty)
Status: Confirmed => Fix Committed
** Changed in: linux (Ubuntu Utopic)
Status: Confirmed => Fix Committed
** Changed in: linux (Ubuntu Vivid)
Status: Confirmed => Fix Committed
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https://bugs.launchpad.net/bugs/1460657
Title:
possible infinite loop when parsing CDC headers
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Trusty:
Fix Committed
Status in linux source package in Utopic:
Fix Committed
Status in linux source package in Vivid:
Fix Committed
Bug description:
Bug #1413992 's patch introduced a possible infinite loop.
commit 0d3bba0287d4e284c3ec7d3397e81eec920d5e7e
Author: Quentin Casasnovas <[email protected]>
Date: Tue Apr 14 11:25:43 2015 +0200
cdc-acm: prevent infinite loop when parsing CDC headers.
Phil and I found out a problem with commit:
7e860a6e7aa6 ("cdc-acm: add sanity checks")
It added some sanity checks to ignore potential garbage in CDC headers but
also introduced a potential infinite loop. This can happen at the first
loop iteration (elength = 0 in that case) if the description isn't a
DT_CS_INTERFACE or later if 'buffer[0]' is zero.
It should also be noted that the wrong length was being added to 'buffer'
in case 'buffer[1]' was not a DT_CS_INTERFACE descriptor, since elength
was
assigned after that check in the loop.
A specially crafted USB device could be used to trigger this
infinite loop.
Fixes: 7e860a6e7aa6 ("cdc-acm: add sanity checks")
Signed-off-by: Phil Turnbull <[email protected]>
Signed-off-by: Quentin Casasnovas <[email protected]>
CC: Sergei Shtylyov <[email protected]>
CC: Oliver Neukum <[email protected]>
CC: Adam Lee <[email protected]>
CC: <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
===
break-fix: 7e860a6e7aa62b337a61110430cd633db5b0d2dd
0d3bba0287d4e284c3ec7d3397e81eec920d5e7e
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