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| author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2019-07-24 10:46:58 +0800 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2019-09-15 22:42:10 +0200 |
| commit | f2538f999345405f7d2e1194c0c8efa4e11f7b3a (patch) | |
| tree | 3d7558b9a985024eb9eb80cda548153d5f89c858 /fs/jffs2 | |
| parent | e46131b9fd31155a552dea598e7d915b64c5c04c (diff) | |
| download | lwn-f2538f999345405f7d2e1194c0c8efa4e11f7b3a.tar.gz lwn-f2538f999345405f7d2e1194c0c8efa4e11f7b3a.zip | |
jffs2: Fix possible null-pointer dereferences in jffs2_add_frag_to_fragtree()
In jffs2_add_frag_to_fragtree(), there is an if statement on line 223 to
check whether "this" is NULL:
if (this)
When "this" is NULL, it is used at several places, such as on line 249:
if (this->node)
and on line 260:
if (newfrag->ofs > this->ofs)
Thus possible null-pointer dereferences may occur.
To fix these bugs, -EINVAL is returned when "this" is NULL.
These bugs are found by a static analysis tool STCheck written by us.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'fs/jffs2')
| -rw-r--r-- | fs/jffs2/nodelist.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/jffs2/nodelist.c b/fs/jffs2/nodelist.c index b86c78d178c6..021a4a2190ee 100644 --- a/fs/jffs2/nodelist.c +++ b/fs/jffs2/nodelist.c @@ -226,7 +226,7 @@ static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *r lastend = this->ofs + this->size; } else { dbg_fragtree2("lookup gave no frag\n"); - lastend = 0; + return -EINVAL; } /* See if we ran off the end of the fragtree */ |