mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-28 13:22:57 +00:00
Code Issues Releases Wiki Activity

Bluetooth: btmrvl_sdio: Remove all strcpy() uses

Browse source 
strcpy() performs no bounds checking on the destination buffer. This
could result in linear overflows beyond the end of the buffer, leading
to all kinds of misbehaviors. The safe replacement is strscpy() but in
this case it is better to use the scnprintf to simplify the arithmetic.

This is a previous step in the path to remove the strcpy() function
entirely from the kernel.

Signed-off-by: Len Baker <len.baker@gmx.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Len Baker 2021-07-24 14:21:52 +02:00 committed by Marcel Holtmann
parent 92fe24a7db
commit 785077fa2d
1 changed files with 12 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
drivers/bluetooth/btmrvl_sdio.c
View file

@ -1350,6 +1350,7 @@ static void btmrvl_sdio_coredump(struct device *dev)
u8 *dbg_ptr, *end_ptr, *fw_dump_data, *fw_dump_ptr;
u8 dump_num = 0, idx, i, read_reg, doneflag = 0;
u32 memory_size, fw_dump_len = 0;
int size = 0;
card = sdio_get_drvdata(func);
priv = card->priv;
@ -1478,7 +1479,7 @@ static void btmrvl_sdio_coredump(struct device *dev)
if (fw_dump_len == 0)
return;
fw_dump_data = vzalloc(fw_dump_len+1);
fw_dump_data = vzalloc(fw_dump_len + 1);
if (!fw_dump_data) {
BT_ERR("Vzalloc fw_dump_data fail!");
return;
@ -1493,20 +1494,18 @@ static void btmrvl_sdio_coredump(struct device *dev)
struct memory_type_mapping *entry = &mem_type_mapping_tbl[idx];
if (entry->mem_ptr) {
strcpy(fw_dump_ptr, "========Start dump ");
fw_dump_ptr += strlen("========Start dump ");
size += scnprintf(fw_dump_ptr + size,
fw_dump_len + 1 - size,
"========Start dump %s========\n",
entry->mem_name);
strcpy(fw_dump_ptr, entry->mem_name);
fw_dump_ptr += strlen(entry->mem_name);
memcpy(fw_dump_ptr + size, entry->mem_ptr,
entry->mem_size);
size += entry->mem_size;
strcpy(fw_dump_ptr, "========\n");
fw_dump_ptr += strlen("========\n");
memcpy(fw_dump_ptr, entry->mem_ptr, entry->mem_size);
fw_dump_ptr += entry->mem_size;
strcpy(fw_dump_ptr, "\n========End dump========\n");
fw_dump_ptr += strlen("\n========End dump========\n");
size += scnprintf(fw_dump_ptr + size,
fw_dump_len + 1 - size,
"\n========End dump========\n");
vfree(mem_type_mapping_tbl[idx].mem_ptr);
mem_type_mapping_tbl[idx].mem_ptr = NULL;