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block metadata changes on shared images 

If images are shared (ref count > 1), block changes to the set of
metadata items on the image. These can cause crashes in highly threaded
programs.

See https://github.com/lovell/sharp/issues/1986
This commit is contained in:
John Cupitt 2019-11-28 09:59:30 +00:00
parent 1a2a4a41f1
commit 20cee5d041
1 changed files with 14 additions and 0 deletions
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14
libvips/iofuncs/header.c
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@ -1020,6 +1020,13 @@ vips_image_set( VipsImage *image, const char *name, GValue *value )
g_assert( name );
g_assert( value );
/* If this image is shared, block metadata changes.
*/
if( G_OBJECT( image )->ref_count > 1 ) {
g_info( "can't set metadata \"%s\" on shared image", name );
return;
}
meta_init( image );
(void) meta_new( image, name, value );
@ -1213,6 +1220,13 @@ vips_image_get_typeof( const VipsImage *image, const char *name )
gboolean
vips_image_remove( VipsImage *image, const char *name )
{
/* If this image is shared, block metadata changes.
*/
if( G_OBJECT( image )->ref_count > 1 ) {
g_info( "can't remove metadata \"%s\" on shared image", name );
return( FALSE );
}
if( image->meta &&
g_hash_table_remove( image->meta, name ) )
return( TRUE );