Question

I have been using valgrind to debug my program (the program functions fine, just perfecting it) and it has returned one invalid pointer warning that I am having a difficult time fixing, so I was just wondering if someone could point me in the right direction? will post both the error valgrind gave me as well as the line (and a few that precede it) that valgrind is pointing to, thanks!

==9437== Invalid read of size 1
==9437==    at 0x4C25812: __GI_strlen (mc_replace_strmem.c:284)
==9437==    by 0x400F67: main (exec_deathinfo_c.c:95)
==9437==  Address 0x0 is not stack'd, malloc'd or (recently) free'd


char *name;
char *filename;
name = getenv("MCEXEC_PLAYERNAME");
filename = malloc(sizeof "/home/minecraft/freedonia/playerdata/deathlog-.txt" - 1 + strlen(name)  + 1);

Answer 1

==9437== Invalid read of size 1
==9437==    at 0x4C25812: __GI_strlen (mc_replace_strmem.c:284)
==9437==    by 0x400F67: main (exec_deathinfo_c.c:95)
Address 0x0 is not stack'd, malloc'd or (recently) free'd

suggests that

name = getenv("MCEXEC_PLAYERNAME");

returned NULL.