avformat/aaxdec: Fix potential integer overflow

The AAX demuxer reads a 32bit number containing the amount of entries
of an array and stores it in an uint32_t. Yet when iterating over this
array, a loop counter of type int is used. This leads to undefined
behaviour if the amount of entries is not in the range of int; to avoid
this, it is generally good to use the same type for the loop counter as
for the variable it is compared to. This is done in one of the two loops
affected by this.

In the other loop, the undefined behaviour can begin even earlier: Here
the loop counter is multiplied by an uint16_t which can overflow as soon
as the loop counter is > 2^15. Using an unsigned type would avoid the
undefined behaviour, but truncation would still be possible, so use an
uint64_t.

Also use an uint32_t for a variable containing an index in said array.

This fixes Coverity issue #1466767.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

diff --git a/libavformat/aaxdec.c b/libavformat/aaxdec.c
index cfd2e10a15703fb28c06f0e772390395402ed480..3db6e9bc6d8e4c87df1befeb776bb99acc43e908 100644 (file)
--- a/libavformat/aaxdec.c
+++ b/libavformat/aaxdec.c
@@ -51,7 +51,7 @@ typedef struct AAXContext {
     int64_t strings_size;
     char *string_table;
 
-    int current_segment;
+    uint32_t current_segment;
 
     AAXColumn *xcolumns;
     AAXSegment *segments;
@@ -239,7 +239,7 @@ static int aax_read_header(AVFormatContext *s)
         flag = a->xcolumns[c].flag;
         col_offset = a->xcolumns[c].offset;
 
-        for (int r = 0; r < a->nb_segments; r++) {
+        for (uint64_t r = 0; r < a->nb_segments; r++) {
             if (flag & COLUMN_FLAG_DEFAULT) {
                 data_offset = a->schema_offset + col_offset;
             } else if (flag & COLUMN_FLAG_ROW) {
@@ -330,7 +330,7 @@ static int aax_read_packet(AVFormatContext *s, AVPacket *pkt)
 
     pkt->pos = avio_tell(pb);
 
-    for (int seg = 0; seg < a->nb_segments; seg++) {
+    for (uint32_t seg = 0; seg < a->nb_segments; seg++) {
         int64_t start = a->segments[seg].start;
         int64_t end   = a->segments[seg].end;