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author | Anson Huang <Anson.Huang@nxp.com> | 2019-06-14 16:07:47 +0800 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-06 19:08:05 +0200 |
commit | 98e40b4b528acc0451322be749106c4257d8b0c3 (patch) | |
tree | d83dcdb7a27c7a25c31775155e6a7075ffc80324 /drivers/soc/imx | |
parent | bd29d93d6b77194c0b0a3e5af4591d2b4f148ade (diff) | |
download | linux-stable-98e40b4b528acc0451322be749106c4257d8b0c3.tar.gz linux-stable-98e40b4b528acc0451322be749106c4257d8b0c3.tar.bz2 linux-stable-98e40b4b528acc0451322be749106c4257d8b0c3.zip |
soc: imx8: Fix potential kernel dump in error path
[ Upstream commit 1bcbe7300815e91fef18ee905b04f65490ad38c9 ]
When SoC's revision value is 0, SoC driver will print out
"unknown" in sysfs's revision node, this "unknown" is a
static string which can NOT be freed, this will caused below
kernel dump in later error path which calls kfree:
kernel BUG at mm/slub.c:3942!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
Modules linked in:
CPU: 2 PID: 1 Comm: swapper/0 Not tainted 5.2.0-rc4-next-20190611-00023-g705146c-dirty #2197
Hardware name: NXP i.MX8MQ EVK (DT)
pstate: 60000005 (nZCv daif -PAN -UAO)
pc : kfree+0x170/0x1b0
lr : imx8_soc_init+0xc0/0xe4
sp : ffff00001003bd10
x29: ffff00001003bd10 x28: ffff00001121e0a0
x27: ffff000011482000 x26: ffff00001117068c
x25: ffff00001121e100 x24: ffff000011482000
x23: ffff000010fe2b58 x22: ffff0000111b9ab0
x21: ffff8000bd9dfba0 x20: ffff0000111b9b70
x19: ffff7e000043f880 x18: 0000000000001000
x17: ffff000010d05fa0 x16: ffff0000122e0000
x15: 0140000000000000 x14: 0000000030360000
x13: ffff8000b94b5bb0 x12: 0000000000000038
x11: ffffffffffffffff x10: ffffffffffffffff
x9 : 0000000000000003 x8 : ffff8000b9488147
x7 : ffff00001003bc00 x6 : 0000000000000000
x5 : 0000000000000003 x4 : 0000000000000003
x3 : 0000000000000003 x2 : b8793acd604edf00
x1 : ffff7e000043f880 x0 : ffff7e000043f888
Call trace:
kfree+0x170/0x1b0
imx8_soc_init+0xc0/0xe4
do_one_initcall+0x58/0x1b8
kernel_init_freeable+0x1cc/0x288
kernel_init+0x10/0x100
ret_from_fork+0x10/0x18
This patch fixes this potential kernel dump when a chip's
revision is "unknown", it is done by checking whether the
revision space can be freed.
Fixes: a7e26f356ca1 ("soc: imx: Add generic i.MX8 SoC driver")
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/soc/imx')
-rw-r--r-- | drivers/soc/imx/soc-imx8.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/soc/imx/soc-imx8.c b/drivers/soc/imx/soc-imx8.c index e567d866a9d3..79a3d922a4a9 100644 --- a/drivers/soc/imx/soc-imx8.c +++ b/drivers/soc/imx/soc-imx8.c @@ -112,7 +112,8 @@ static int __init imx8_soc_init(void) return 0; free_rev: - kfree(soc_dev_attr->revision); + if (strcmp(soc_dev_attr->revision, "unknown")) + kfree(soc_dev_attr->revision); free_soc: kfree(soc_dev_attr); of_node_put(root); |