Description: ALSA: line6: Fix write on zero-sized buffer
References:
 https://syzkaller.appspot.com/bug?id=240f09164db2c3d3af33a117c713dc7650dc29d6
Notes:
 bwh> The fix for this introduced a memory leak, fixed by upstream commit
 bwh> 1bc8d18c75fe "ALSA: line6: Fix memory leak at line6_init_pcm() error
 bwh> path".  I haven't backported that to 3.16 as it depends on earlier
 bwh> refactoring of the driver, and a small memory leak is still better
 bwh> than this issue.
Bugs:
upstream: released (5.2) [3450121997ce872eb7f1248417225827ea249710]
4.19-upstream-stable: released (4.19.58) [7f52af5e9baa9c478edcecdd4058eeef2835b1c3]
4.9-upstream-stable: released (4.9.185) [8b449e9dc215e47641c4737a199b7767ffd032a9]
3.16-upstream-stable: released (3.16.74) [f1508f326a3b8f29beef9ca399bec516ecfd0b2a]
sid: released (5.2.6-1)
4.19-buster-security: released (4.19.67-1)
4.9-stretch-security: released (4.9.185-1)
3.16-jessie-security: released (3.16.74-1)