On Fri, 2016-04-15 at 17:04 -0700, Stefan Beller wrote:
> > +static int try_shm(struct index_state *istate)
> > +{
> > + void *new_mmap = NULL;
> > + size_t old_size = istate->mmap_size;
> > + ssize_t new_size;
> > + const unsigned char *sha1;
> > + struct stat st;
> > + int fd;
> > +
> > + if (!is_main_index(istate) ||
> > + old_size <= 20 ||
> > + stat(git_path("index-helper.path"), &st))
> > + return -1;
> > + if (poke_daemon(istate, &st, 0))
> > + return -1;
> > + sha1 = (unsigned char *)istate->mmap + old_size - 20;
> > +
> > + fd = open(index_helper_path("git-index-%s",
> > sha1_to_hex(sha1)),
> > + O_RDONLY);
> > + if (fd < 0)
> > + goto fail;
> > +
> > + if (fstat(fd, &st))
> > + goto fail;
> > +
> > + new_size = st.st_size;
> > + new_mmap = mmap(NULL, new_size, PROT_READ, MAP_SHARED, fd,
> > 0);
> > + if (new_size <= 20 ||
> > + hashcmp((unsigned char *)istate->mmap + old_size - 20,
> > + (unsigned char *)new_mmap + new_size - 20)) {
> > + if (new_mmap)
> > + munmap(new_mmap, new_size);
> > + goto fail;
>
> coming from here
>
> > + }
> > +
> > + /* The memory barrier here matches index
> > -helper.c:share_index. */
> > + __sync_synchronize();
> > +
> > + munmap(istate->mmap, istate->mmap_size);
> > + istate->mmap = new_mmap;
> > + istate->mmap_size = new_size;
> > + istate->from_shm = 1;
> > + return 0;
> > +
> > +fail:
>
> fd may be leaking here?
>
> > + poke_daemon(istate, &st, 1);
> > + return -1;
> > +}
> > +
Good point. (It's also leaking on the happy path -- will fix all of
those)
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