mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

pinctrl: renesas: checker: Limit cfg reg enum checks to provided IDs 

[ Upstream commit 3803584a4e ]

If the number of provided enum IDs in a variable width config register
description does not match the expected number, the checker uses the
expected number for validating the individual enum IDs.

However, this may cause out-of-bounds accesses on the array holding the
enum IDs, leading to bogus enum_id conflict warnings.  Worse, if the bug
is an incorrect bit field description (e.g. accidentally using "12"
instead of "-12" for a reserved field), thousands of warnings may be
printed, overflowing the kernel log buffer.

Fix this by limiting the enum ID check to the number of provided enum
IDs.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/c7385f44f2faebb8856bcbb4e908d846fc1531fb.1705930809.git.geert+renesas@glider.be
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Geert Uytterhoeven 2024-01-22 14:43:38 +01:00 committed by Greg Kroah-Hartman
parent bd72c5245f
commit b02945e920
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/pinctrl/renesas/core.c
View File

@ -909,9 +909,11 @@ static void __init sh_pfc_check_cfg_reg(const char *drvname,
sh_pfc_err("reg 0x%x: var_field_width declares %u instead of %u bits\n",
cfg_reg->reg, rw, cfg_reg->reg_width);
if (n != cfg_reg->nr_enum_ids)
if (n != cfg_reg->nr_enum_ids) {
sh_pfc_err("reg 0x%x: enum_ids[] has %u instead of %u values\n",
cfg_reg->reg, cfg_reg->nr_enum_ids, n);
n = cfg_reg->nr_enum_ids;
}
check_enum_ids:
sh_pfc_check_reg_enums(drvname, cfg_reg->reg, cfg_reg->enum_ids, n);