[PATCH] nftl_format: prevent unsigned underflow in INFTL virtual unit calculation

[David Oberhollenzer]

Hi,

On 1/27/26 1:31 PM, Anton Moryakov wrote:
> @@ -371,6 +371,8 @@ int main(int argc, char **argv)
>   		maxzones = meminfo.size / meminfo.erasesize;
>   		pezstart = startofs / meminfo.erasesize + 1;
>   		pezend = startofs / meminfo.erasesize + ezones - 1;
> +		if (ezones < 2)
> +   			exit(EXIT_FAILURE);
>   		numvunits = (ezones - 2) * PERCENTUSED / 100;
>   		for (ezone = pezstart; ezone < maxzones; ezone++) {
>   			if (BadUnitTable[ezone] != ZONE_GOOD) {

I think at the very least we should produce some sort of error message
if this is triggered. Maybe a simple `assert(ezones >= 2)` should be
preferred here?

Greetings,

David