diff options
| author | ruanjinjie <ruanjinjie@huawei.com> | 2022-12-11 03:33:37 +0100 |
|---|---|---|
| committer | Rob Herring <robh@kernel.org> | 2022-12-12 02:00:36 +0100 |
| commit | ee9d7a0e754568180a2f8ebc4aad226278a9116f (patch) | |
| tree | 5ef87d93bb09b6b1080b69f8cdd49ff2d487a73c /drivers/of | |
| parent | dt-bindings: lcdif: Fix constraints for imx8mp (diff) | |
| download | linux-ee9d7a0e754568180a2f8ebc4aad226278a9116f.tar.xz linux-ee9d7a0e754568180a2f8ebc4aad226278a9116f.zip | |
of: overlay: fix null pointer dereferencing in find_dup_cset_node_entry() and find_dup_cset_prop()
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@huawei.com>
Link: https://lore.kernel.org/r/20221211023337.592266-1-ruanjinjie@huawei.com
Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/overlay.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c index bd8ff4df723d..ed4e6c144a68 100644 --- a/drivers/of/overlay.c +++ b/drivers/of/overlay.c @@ -545,7 +545,7 @@ 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) { @@ -580,7 +580,7 @@ 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 && |