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Ensure EXIF is at least 4 bytes before inspection #3109

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Oct 22, 2022
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Ensure EXIF is at least 4 bytes before inspection #3109

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4 changes: 4 additions & 0 deletions libvips/foreign/exif.c
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Original file line number Diff line number Diff line change
Expand Up @@ -167,6 +167,10 @@ vips_exif_load_data_without_fix( const void *data, size_t length )
/* exif_data_load_data() only allows uint for length. Limit it to less
* than that: 2**20 should be enough for anyone.
*/
if( length < 4 ) {
vips_error( "exif", "%s", _( "exif too small" ) );
return( NULL );
}
if( length > 1 << 20 ) {
vips_error( "exif", "%s", _( "exif too large" ) );
return( NULL );
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