On Fri, 2016-04-15 at 17:07 -0700, Stefan Beller wrote:
> > +static void refresh_by_watchman(struct index_state *istate)
> > +{
> > + void *shm = NULL;
> > + int length;
> > + int i;
> > + struct stat st;
> > + int fd = -1;
> > + const char *path = index_helper_path("git-watchman-%s
> > -%"PRIuMAX,
> > + sha1_to_hex(istate
> > ->sha1),
> > + (uintmax_t)getpid());
> > +
> > + fd = open(path, O_RDONLY);
> > + if (fd < 0)
> > + return;
> > +
> > + /*
> > + * This watchman data is just for us -- no need to keep it
> > + * around once we've got it open.
> > + */
> > + unlink(path);
> > +
> > + if (fstat(fd, &st) < 0)
> > + goto done;
> > +
> > + length = st.st_size;
> > + shm = mmap(NULL, length, PROT_READ, MAP_SHARED, fd, 0);
> > +
> > + if (shm == MAP_FAILED)
> > + goto done;
> > +
> > + close(fd);
> > + fd = -1;
> > +
> > + if (length <= 20 ||
> > + hashcmp(istate->sha1, (unsigned char *)shm + length -
> > 20) ||
> > + /*
> > + * No need to clear CE_WATCHMAN_DIRTY set by 'WAMA' on
> > + * disk. Watchman can only set more, not clear any, so
> > + * this is OR mask.
> > + */
> > + read_watchman_ext(istate, shm, length - 20))
> > + goto done;
> > +
> > + /*
> > + * Now that we've marked the invalid entries in the
> > + * untracked-cache itself, we can erase them from the list
> > of
> > + * entries to be processed and mark the untracked cache for
> > + * watchman usage.
> > + */
> > + if (istate->untracked) {
> > + string_list_clear(&istate->untracked
> > ->invalid_untracked, 0);
> > + istate->untracked->use_watchman = 1;
> > + }
> > +
> > + for (i = 0; i < istate->cache_nr; i++) {
> > + struct cache_entry *ce = istate->cache[i];
> > + if (ce_stage(ce) || (ce->ce_flags &
> > CE_WATCHMAN_DIRTY))
> > + continue;
> > + ce_mark_uptodate(ce);
> > + }
> > +done:
> > + if (shm)
> > + munmap(shm, length);
> > +
> > + if (fd > 0)
> > + close(fd);
>
> coverities opinion:
> > off_by_one: Testing whether handle fd is strictly greater than zero
> > is suspicious.
> > fd leaks when it is zero. Did you intend to include equality with
> > zero?
>
> We can assert that fd is never 0, because that is where stdin is?
You are right: it should be if (fd >= 0). Will fix. Thanks.
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