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btrfs-progs: Fix NULL pointer when receive clone operation 

Regression introduced by a2f7af94ab
"btrfs-progs: subvol_uuid_search: return error encoded pointer"
IS_ERR() will only check if it's an error code, won't check if it's
NULL.  And for all the caller the commit modifies, it can return NULL
and makes cause segfault.

Fix it by introducing new IS_ERR_OR_NULL() macro, and for NULL pointer
and needs to return int case, convert NULL pointer to -ENOENT.

Reported-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Tested-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
master
Qu Wenruo 2016-12-15 16:37:02 +08:00 committed by David Sterba
parent e27189a391
commit e0485281ed
3 changed files with 35 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
cmds-receive.c
View File

@ -287,13 +287,16 @@ static int process_snapshot(const char *path, const u8 *uuid, u64 ctransid,
parent_subvol = subvol_uuid_search(&rctx->sus, 0, parent_uuid,
parent_ctransid, NULL,
subvol_search_by_received_uuid);
if (IS_ERR(parent_subvol)) {
if (IS_ERR_OR_NULL(parent_subvol)) {
parent_subvol = subvol_uuid_search(&rctx->sus, 0, parent_uuid,
parent_ctransid, NULL,
subvol_search_by_uuid);
}
if (IS_ERR(parent_subvol)) {
ret = PTR_ERR(parent_subvol);
if (IS_ERR_OR_NULL(parent_subvol)) {
if (!parent_subvol)
ret = -ENOENT;
else
ret = PTR_ERR(parent_subvol);
error("cannot find parent subvolume");
goto out;
}
@ -750,13 +753,16 @@ static int process_clone(const char *path, u64 offset, u64 len,
si = subvol_uuid_search(&rctx->sus, 0, clone_uuid, clone_ctransid,
NULL,
subvol_search_by_received_uuid);
if (IS_ERR(si)) {
if (IS_ERR_OR_NULL(si)) {
if (memcmp(clone_uuid, rctx->cur_subvol.received_uuid,
BTRFS_UUID_SIZE) == 0) {
/* TODO check generation of extent */
subvol_path = strdup(rctx->cur_subvol_path);
} else {
ret = PTR_ERR(si);
if (!si)
ret = -ENOENT;
else
ret = PTR_ERR(si);
error("clone: did not find source subvol");
goto out;
}

26
cmds-send.c
View File

@ -70,8 +70,12 @@ static int get_root_id(struct btrfs_send *sctx, const char *path, u64 *root_id)
si = subvol_uuid_search(&sctx->sus, 0, NULL, 0, path,
subvol_search_by_path);
if (IS_ERR(si))
return PTR_ERR(si);
if (IS_ERR_OR_NULL(si)) {
if (!si)
return -ENOENT;
else
return PTR_ERR(si);
}
*root_id = si->root_id;
free(si->path);
free(si);
@ -85,7 +89,7 @@ static struct subvol_info *get_parent(struct btrfs_send *sctx, u64 root_id)
si_tmp = subvol_uuid_search(&sctx->sus, root_id, NULL, 0, NULL,
subvol_search_by_root_id);
if (IS_ERR(si_tmp))
if (IS_ERR_OR_NULL(si_tmp))
return si_tmp;
si = subvol_uuid_search(&sctx->sus, 0, si_tmp->parent_uuid, 0, NULL,
@ -105,8 +109,11 @@ static int find_good_parent(struct btrfs_send *sctx, u64 root_id, u64 *found)
int i;
parent = get_parent(sctx, root_id);
if (IS_ERR(parent)) {
ret = PTR_ERR(parent);
if (IS_ERR_OR_NULL(parent)) {
if (!parent)
ret = -ENOENT;
else
ret = PTR_ERR(parent);
goto out;
}
@ -122,7 +129,7 @@ static int find_good_parent(struct btrfs_send *sctx, u64 root_id, u64 *found)
s64 tmp;
parent2 = get_parent(sctx, sctx->clone_sources[i]);
if (IS_ERR(parent2))
if (IS_ERR_OR_NULL(parent2))
continue;
if (parent2->root_id != parent->root_id) {
free(parent2->path);
@ -136,8 +143,11 @@ static int find_good_parent(struct btrfs_send *sctx, u64 root_id, u64 *found)
parent2 = subvol_uuid_search(&sctx->sus,
sctx->clone_sources[i], NULL, 0, NULL,
subvol_search_by_root_id);
if (IS_ERR(parent2)) {
ret = PTR_ERR(parent2);
if (IS_ERR_OR_NULL(parent2)) {
if (!parent2)
ret = -ENOENT;
else
ret = PTR_ERR(parent2);
goto out;
}
tmp = parent2->ctransid - parent->ctransid;

7
kerncompat.h
View File

@ -244,11 +244,16 @@ static inline long PTR_ERR(const void *ptr)
return (long) ptr;
}
static inline long IS_ERR(const void *ptr)
static inline int IS_ERR(const void *ptr)
{
return IS_ERR_VALUE((unsigned long)ptr);
}
static inline int IS_ERR_OR_NULL(const void *ptr)
{
return !ptr || IS_ERR(ptr);
}
/*
* This looks more complex than it should be. But we need to
* get the type for the ~ right in round_down (it needs to be