This is a note to let you know that I've just added the patch titled
of: overlay: fix null pointer dereferencing in find_dup_cset_node_entry() and find_dup_cset_prop()
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
of-overlay-fix-null-pointer-dereferencing-in-find_du.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 4037e9bd06e550ab5398144afee043975c742ab5
Author: ruanjinjie <ruanjinjie@xxxxxxxxxx>
Date: Sun Dec 11 10:33:37 2022 +0800
of: overlay: fix null pointer dereferencing in find_dup_cset_node_entry() and find_dup_cset_prop()
[ Upstream commit ee9d7a0e754568180a2f8ebc4aad226278a9116f ]
When kmalloc() fail to allocate memory in kasprintf(), fn_1 or fn_2 will
be NULL, and strcmp() will cause null pointer dereference.
Fixes: 2fe0e8769df9 ("of: overlay: check prevents multiple fragments touching same property")
Signed-off-by: ruanjinjie <ruanjinjie@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221211023337.592266-1-ruanjinjie@xxxxxxxxxx
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index c8a0c0e9dec1..67b404f36e79 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -547,7 +547,7 @@ static int find_dup_cset_node_entry(struct overlay_changeset *ovcs,
fn_1 = kasprintf(GFP_KERNEL, "%pOF", ce_1->np);
fn_2 = kasprintf(GFP_KERNEL, "%pOF", ce_2->np);
- node_path_match = !strcmp(fn_1, fn_2);
+ node_path_match = !fn_1 || !fn_2 || !strcmp(fn_1, fn_2);
kfree(fn_1);
kfree(fn_2);
if (node_path_match) {
@@ -582,7 +582,7 @@ static int find_dup_cset_prop(struct overlay_changeset *ovcs,
fn_1 = kasprintf(GFP_KERNEL, "%pOF", ce_1->np);
fn_2 = kasprintf(GFP_KERNEL, "%pOF", ce_2->np);
- node_path_match = !strcmp(fn_1, fn_2);
+ node_path_match = !fn_1 || !fn_2 || !strcmp(fn_1, fn_2);
kfree(fn_1);
kfree(fn_2);
if (node_path_match &&
