819b6be2db
common/lib/libc/stdlib/random.c:482:6 can result in signed integer overflow.
This bug was reported by UBSan runs.
The change has been tested using the following program to generate random numbers
in both the old and the new library and can be used to verify the correctness of the
library after the change.
#include <stdio.h>
#include <stdlib.h>
#define COUNT 1000 * 1000
int
main(void)
{
int i;
FILE *fp = fopen("numbers.txt", "w");
srandom(0xdeadbeef);
for(i = 0; i < COUNT; i++) {
fprintf(fp, "%ld\n", random());
}
fclose(fp);
return 0;
}
Reviewed by: riastradh@ , kamil@
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