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avoid size_t pixel counts in cgifsave 

since we limit frame size to INT_SIZE / 4
This commit is contained in:
John Cupitt 2022-06-19 12:26:02 +01:00
parent 905a6fe79f
commit 89615465b7
1 changed files with 7 additions and 4 deletions
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11
libvips/foreign/cgifsave.c
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@ -188,11 +188,11 @@ vips__cgif_write( void *client, const uint8_t *buffer, const size_t length )
*/
static void
vips_foreign_save_cgif_set_transparent( VipsForeignSaveCgif *cgif,
VipsPel *old, VipsPel *new, VipsPel *index, size_t n_pels, int trans )
VipsPel *old, VipsPel *new, VipsPel *index, int n_pels, int trans )
{
int sq_maxerror = cgif->interframe_maxerror * cgif->interframe_maxerror;
size_t i;
int i;
for( i = 0; i < n_pels; i++ ) {
/* Alpha must match
@ -427,12 +427,12 @@ vips_foreign_save_cgif_write_frame( VipsForeignSaveCgif *cgif )
*/
VipsPel *frame_bytes =
VIPS_REGION_ADDR( cgif->frame, 0, frame_rect->top );
size_t n_pels = (size_t) frame_rect->height * frame_rect->width;
int n_pels = frame_rect->height * frame_rect->width;
gboolean has_transparency;
gboolean has_alpha_constraint;
VipsPel * restrict p;
size_t i;
int i;
VipsQuantiseImage *image;
gboolean use_local;
VipsQuantiseResult *quantisation_result;
@ -706,6 +706,9 @@ vips_foreign_save_cgif_build( VipsObject *object )
/* Reject images that exceed the pixel limit of libimagequant,
* or that exceed the GIF limit of 64k per axis.
*
* Frame width * height will fit in an int, though frame size will
* need at least a uint.
*/
if( (guint64) frame_rect.width * frame_rect.height > INT_MAX / 4 ||
frame_rect.width > 65535 ||