image/jpeg: when following component selectors, only consider valid

components. This fixes decoding JPEG images where the component selector is 0. Such images are rare, but not impossible. Change-Id: I6d221bce01cce8cc0440e117543233371782ca22 Reviewed-on: https://go-review.googlesource.com/6421 Reviewed-by: Rob Pike <[email protected]>
thorandre · Mar 3, 2015 · 0fe6b12 · 0fe6b12
1 parent 40ff393
commit 0fe6b12
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/image/jpeg/scan.go b/src/image/jpeg/scan.go
@@ -66,7 +66,7 @@ func (d *decoder) processSOS(n int) error {
  for i := 0; i < nComp; i++ {
  cs := d.tmp[1+2*i] // Component selector.
  compIndex := -1
- for j, comp := range d.comp {
+ for j, comp := range d.comp[:d.nComp] {
  if cs == comp.c {
  compIndex = j
  }