From 3d251a5b9e2f09edcf25bbffe1fa308d0f648bf1 Mon Sep 17 00:00:00 2001 From: Akinobu Mita Date: Thu, 3 Jan 2013 21:19:09 +0900 Subject: UBIFS: rename random32() to prandom_u32() Use more preferable function name which implies using a pseudo-random number generator. Signed-off-by: Akinobu Mita Signed-off-by: Artem Bityutskiy --- fs/ubifs/debug.c | 8 ++++---- fs/ubifs/lpt_commit.c | 14 +++++++------- fs/ubifs/tnc_commit.c | 2 +- 3 files changed, 12 insertions(+), 12 deletions(-) (limited to 'fs/ubifs') diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c index 12817ffc7345..7f60e900edff 100644 --- a/fs/ubifs/debug.c +++ b/fs/ubifs/debug.c @@ -2459,7 +2459,7 @@ error_dump: static inline int chance(unsigned int n, unsigned int out_of) { - return !!((random32() % out_of) + 1 <= n); + return !!((prandom_u32() % out_of) + 1 <= n); } @@ -2477,13 +2477,13 @@ static int power_cut_emulated(struct ubifs_info *c, int lnum, int write) if (chance(1, 2)) { d->pc_delay = 1; /* Fail withing 1 minute */ - delay = random32() % 60000; + delay = prandom_u32() % 60000; d->pc_timeout = jiffies; d->pc_timeout += msecs_to_jiffies(delay); ubifs_warn("failing after %lums", delay); } else { d->pc_delay = 2; - delay = random32() % 10000; + delay = prandom_u32() % 10000; /* Fail within 10000 operations */ d->pc_cnt_max = delay; ubifs_warn("failing after %lu calls", delay); @@ -2563,7 +2563,7 @@ static int corrupt_data(const struct ubifs_info *c, const void *buf, unsigned int from, to, ffs = chance(1, 2); unsigned char *p = (void *)buf; - from = random32() % (len + 1); + from = prandom_u32() % (len + 1); /* Corruption may only span one max. write unit */ to = min(len, ALIGN(from, c->max_write_size)); diff --git a/fs/ubifs/lpt_commit.c b/fs/ubifs/lpt_commit.c index 9daaeef675dd..4b826abb1528 100644 --- a/fs/ubifs/lpt_commit.c +++ b/fs/ubifs/lpt_commit.c @@ -2007,28 +2007,28 @@ static int dbg_populate_lsave(struct ubifs_info *c) if (!dbg_is_chk_gen(c)) return 0; - if (random32() & 3) + if (prandom_u32() & 3) return 0; for (i = 0; i < c->lsave_cnt; i++) c->lsave[i] = c->main_first; list_for_each_entry(lprops, &c->empty_list, list) - c->lsave[random32() % c->lsave_cnt] = lprops->lnum; + c->lsave[prandom_u32() % c->lsave_cnt] = lprops->lnum; list_for_each_entry(lprops, &c->freeable_list, list) - c->lsave[random32() % c->lsave_cnt] = lprops->lnum; + c->lsave[prandom_u32() % c->lsave_cnt] = lprops->lnum; list_for_each_entry(lprops, &c->frdi_idx_list, list) - c->lsave[random32() % c->lsave_cnt] = lprops->lnum; + c->lsave[prandom_u32() % c->lsave_cnt] = lprops->lnum; heap = &c->lpt_heap[LPROPS_DIRTY_IDX - 1]; for (i = 0; i < heap->cnt; i++) - c->lsave[random32() % c->lsave_cnt] = heap->arr[i]->lnum; + c->lsave[prandom_u32() % c->lsave_cnt] = heap->arr[i]->lnum; heap = &c->lpt_heap[LPROPS_DIRTY - 1]; for (i = 0; i < heap->cnt; i++) - c->lsave[random32() % c->lsave_cnt] = heap->arr[i]->lnum; + c->lsave[prandom_u32() % c->lsave_cnt] = heap->arr[i]->lnum; heap = &c->lpt_heap[LPROPS_FREE - 1]; for (i = 0; i < heap->cnt; i++) - c->lsave[random32() % c->lsave_cnt] = heap->arr[i]->lnum; + c->lsave[prandom_u32() % c->lsave_cnt] = heap->arr[i]->lnum; return 1; } diff --git a/fs/ubifs/tnc_commit.c b/fs/ubifs/tnc_commit.c index 523bbad69c0c..52a6559275c4 100644 --- a/fs/ubifs/tnc_commit.c +++ b/fs/ubifs/tnc_commit.c @@ -683,7 +683,7 @@ static int alloc_idx_lebs(struct ubifs_info *c, int cnt) c->ilebs[c->ileb_cnt++] = lnum; dbg_cmt("LEB %d", lnum); } - if (dbg_is_chk_index(c) && !(random32() & 7)) + if (dbg_is_chk_index(c) && !(prandom_u32() & 7)) return -ENOSPC; return 0; } -- cgit v1.2.2 From 2928f0d0c5ebd6c9605c0d98207a44376387c298 Mon Sep 17 00:00:00 2001 From: Adam Thomas Date: Sat, 2 Feb 2013 22:32:31 +0000 Subject: UBIFS: fix use of freed ubifs_orphan objects The last orphan in the cnext list has its cnext set to NULL. Because of that, ubifs_delete_orphan assumes that it is not on the cnext list and frees it immediately instead of adding it to the dnext list. The freed orphan is later modified by write_orph_node. This can cause various inconsistencies including directory entries that cannot be removed and this error: UBIFS error (pid 20685): layout_cnodes: LPT out of space at LEB 14:129009 needing 17, done_ltab 1, done_lsave 1 This is a regression introduced by "7074e5eb UBIFS: remove invalid reference to list iterator variable". This change adds an explicit flag to ubifs_orphan indicating whether it is pending commit. Signed-off-by: Adam Thomas Reviewed-by: Adrian Hunter Cc: stable@vger.kernel.org # v3.6+ Signed-off-by: Artem Bityutskiy --- fs/ubifs/orphan.c | 7 ++++++- fs/ubifs/ubifs.h | 4 +++- 2 files changed, 9 insertions(+), 2 deletions(-) (limited to 'fs/ubifs') diff --git a/fs/ubifs/orphan.c b/fs/ubifs/orphan.c index 769701ccb5c9..8534d9c6492f 100644 --- a/fs/ubifs/orphan.c +++ b/fs/ubifs/orphan.c @@ -132,7 +132,7 @@ void ubifs_delete_orphan(struct ubifs_info *c, ino_t inum) (unsigned long)inum); return; } - if (o->cnext) { + if (o->cmt) { o->dnext = c->orph_dnext; c->orph_dnext = o; spin_unlock(&c->orphan_lock); @@ -172,7 +172,9 @@ int ubifs_orphan_start_commit(struct ubifs_info *c) last = &c->orph_cnext; list_for_each_entry(orphan, &c->orph_new, new_list) { ubifs_assert(orphan->new); + ubifs_assert(!orphan->cmt); orphan->new = 0; + orphan->cmt = 1; *last = orphan; last = &orphan->cnext; } @@ -299,7 +301,9 @@ static int write_orph_node(struct ubifs_info *c, int atomic) cnext = c->orph_cnext; for (i = 0; i < cnt; i++) { orphan = cnext; + ubifs_assert(orphan->cmt); orph->inos[i] = cpu_to_le64(orphan->inum); + orphan->cmt = 0; cnext = orphan->cnext; orphan->cnext = NULL; } @@ -378,6 +382,7 @@ static int consolidate(struct ubifs_info *c) list_for_each_entry(orphan, &c->orph_list, list) { if (orphan->new) continue; + orphan->cmt = 1; *last = orphan; last = &orphan->cnext; cnt += 1; diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h index d133c276fe05..c16fff7271d3 100644 --- a/fs/ubifs/ubifs.h +++ b/fs/ubifs/ubifs.h @@ -904,6 +904,7 @@ struct ubifs_budget_req { * @dnext: next orphan to delete * @inum: inode number * @new: %1 => added since the last commit, otherwise %0 + * @cmt: %1 => commit pending, otherwise %0 */ struct ubifs_orphan { struct rb_node rb; @@ -912,7 +913,8 @@ struct ubifs_orphan { struct ubifs_orphan *cnext; struct ubifs_orphan *dnext; ino_t inum; - int new; + unsigned new:1; + unsigned cmt:1; }; /** -- cgit v1.2.2 From 8afd500cb52a5d00bab4525dd5a560d199f979b9 Mon Sep 17 00:00:00 2001 From: Adam Thomas Date: Sat, 2 Feb 2013 22:35:08 +0000 Subject: UBIFS: fix double free of ubifs_orphan objects The last orphan in the dnext list has its dnext set to NULL. Because of that, ubifs_delete_orphan assumes that it is not on the dnext list and frees it immediately instead ignoring it as a second delete. The orphan is later freed again by erase_deleted. This change adds an explicit flag to ubifs_orphan indicating whether it is pending delete. Signed-off-by: Adam Thomas Signed-off-by: Artem Bityutskiy Cc: stable@vger.kernel.org --- fs/ubifs/orphan.c | 5 ++++- fs/ubifs/ubifs.h | 2 ++ 2 files changed, 6 insertions(+), 1 deletion(-) (limited to 'fs/ubifs') diff --git a/fs/ubifs/orphan.c b/fs/ubifs/orphan.c index 8534d9c6492f..ba32da3fe08a 100644 --- a/fs/ubifs/orphan.c +++ b/fs/ubifs/orphan.c @@ -126,13 +126,14 @@ void ubifs_delete_orphan(struct ubifs_info *c, ino_t inum) else if (inum > o->inum) p = p->rb_right; else { - if (o->dnext) { + if (o->del) { spin_unlock(&c->orphan_lock); dbg_gen("deleted twice ino %lu", (unsigned long)inum); return; } if (o->cmt) { + o->del = 1; o->dnext = c->orph_dnext; c->orph_dnext = o; spin_unlock(&c->orphan_lock); @@ -447,6 +448,7 @@ static void erase_deleted(struct ubifs_info *c) orphan = dnext; dnext = orphan->dnext; ubifs_assert(!orphan->new); + ubifs_assert(orphan->del); rb_erase(&orphan->rb, &c->orph_tree); list_del(&orphan->list); c->tot_orphans -= 1; @@ -536,6 +538,7 @@ static int insert_dead_orphan(struct ubifs_info *c, ino_t inum) rb_link_node(&orphan->rb, parent, p); rb_insert_color(&orphan->rb, &c->orph_tree); list_add_tail(&orphan->list, &c->orph_list); + orphan->del = 1; orphan->dnext = c->orph_dnext; c->orph_dnext = orphan; dbg_mnt("ino %lu, new %d, tot %d", (unsigned long)inum, diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h index c16fff7271d3..b2babce4d70f 100644 --- a/fs/ubifs/ubifs.h +++ b/fs/ubifs/ubifs.h @@ -905,6 +905,7 @@ struct ubifs_budget_req { * @inum: inode number * @new: %1 => added since the last commit, otherwise %0 * @cmt: %1 => commit pending, otherwise %0 + * @del: %1 => delete pending, otherwise %0 */ struct ubifs_orphan { struct rb_node rb; @@ -915,6 +916,7 @@ struct ubifs_orphan { ino_t inum; unsigned new:1; unsigned cmt:1; + unsigned del:1; }; /** -- cgit v1.2.2