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On Fri, Jan 17, 2020 at 1:03 PM Jordy jordy@simplyhacker.com wrote:
Hello U-Boot lists!
I think I found a double free bug in U-Boot, in /cmp/gpt.c in the function do_rename_gpt_parts().
On line 702 the partition_list is being free'd if ret is smaller than 0. If the return value is not -ENOMEM it will go to the out: label and free the partition_list again.
Reading the code, I can confirm that. Funny enough, the code in question was introduced by commit 18030d04 ("GPT: fix memory leaks identified by Coverity"). Although I think Coverity should have detected the resulting double-free...
However, I'm not sure of the fix: the code just continues for -ENOMEM and then goes on using partitions_list at line 757...
Regards, Simon
Double freeing may result in a write-what-where condition, allowing an attacker to execute arbitrary code.
My advice would be to not free the parition_list on line 702 as nothing is being done with it there afterwards anyway and leave your clean_up in the out: label :)
Kind Regards,
Jordy Zomer