https://github.com/gpac/gpac/blob/c2086a8cb7eb564f402c58710de26317aa4aa857/src/isomedia/isom_read.c#L4553-L4554

Hello~ There are several calls to the function `gf_list_get` in `gf_isom_get_sample_rap_roll_info`, but the return values of `gf_list_get` are not checked before they are referenced. 
Null pointer dereference in gf_isom_get_sample_rap_roll_info
This is a GitHub Issue
repo:gpac
owner:gpac
Title : Null pointer dereference in gf_isom_get_sample_rap_roll_info
Issue date:

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https://github.com/gpac/gpac/blob/c2086a8cb7eb564f402c58710de26317aa4aa857/src/isomedia/isom_read.c#L4553-L4554

Hello~ There are several calls to the function `gf_list_get` in `gf_isom_get_sample_rap_roll_info`, but the return values of `gf_list_get` are not checked before they are referenced. 
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