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| author | Nikita Shubin <nikita.shubin@maquefel.me> | 2020-12-01 12:55:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-30 11:54:29 +0100 |
| commit | 783c5d48b22f5138368406a0b642b6fc2ea29512 (patch) | |
| tree | d4afafb8b0665a863f7c21ff4ff9bbe7c41396de | |
| parent | b98ce1a17266bf33c261534f54e58d7e062d8469 (diff) | |
| download | linux-stable-783c5d48b22f5138368406a0b642b6fc2ea29512.tar.gz linux-stable-783c5d48b22f5138368406a0b642b6fc2ea29512.tar.bz2 linux-stable-783c5d48b22f5138368406a0b642b6fc2ea29512.zip | |
rtc: ep93xx: Fix NULL pointer dereference in ep93xx_rtc_read_time
commit 00c33482bb6110bce8110daa351f9b3baf4df7dc upstream.
Mismatch in probe platform_set_drvdata set's and method's that call
dev_get_platdata will result in "Unable to handle kernel NULL pointer
dereference", let's use according method for getting driver data after
platform_set_drvdata.
8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = (ptrval)
[00000000] *pgd=00000000
Internal error: Oops: 5 [#1] ARM
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 5.9.10-00003-g723e101e0037-dirty #4
Hardware name: Technologic Systems TS-72xx SBC
PC is at ep93xx_rtc_read_time+0xc/0x2c
LR is at __rtc_read_time+0x4c/0x8c
[...]
[<c02b01c8>] (ep93xx_rtc_read_time) from [<c02ac38c>] (__rtc_read_time+0x4c/0x8c)
[<c02ac38c>] (__rtc_read_time) from [<c02ac3f8>] (rtc_read_time+0x2c/0x4c)
[<c02ac3f8>] (rtc_read_time) from [<c02acc54>] (__rtc_read_alarm+0x28/0x358)
[<c02acc54>] (__rtc_read_alarm) from [<c02abd80>] (__rtc_register_device+0x124/0x2ec)
[<c02abd80>] (__rtc_register_device) from [<c02b028c>] (ep93xx_rtc_probe+0xa4/0xac)
[<c02b028c>] (ep93xx_rtc_probe) from [<c026424c>] (platform_drv_probe+0x24/0x5c)
[<c026424c>] (platform_drv_probe) from [<c0262918>] (really_probe+0x218/0x374)
[<c0262918>] (really_probe) from [<c0262da0>] (device_driver_attach+0x44/0x60)
[<c0262da0>] (device_driver_attach) from [<c0262e70>] (__driver_attach+0xb4/0xc0)
[<c0262e70>] (__driver_attach) from [<c0260d44>] (bus_for_each_dev+0x68/0xac)
[<c0260d44>] (bus_for_each_dev) from [<c026223c>] (driver_attach+0x18/0x24)
[<c026223c>] (driver_attach) from [<c0261dd8>] (bus_add_driver+0x150/0x1b4)
[<c0261dd8>] (bus_add_driver) from [<c026342c>] (driver_register+0xb0/0xf4)
[<c026342c>] (driver_register) from [<c0264210>] (__platform_driver_register+0x30/0x48)
[<c0264210>] (__platform_driver_register) from [<c04cb9ac>] (ep93xx_rtc_driver_init+0x10/0x1c)
[<c04cb9ac>] (ep93xx_rtc_driver_init) from [<c000973c>] (do_one_initcall+0x7c/0x1c0)
[<c000973c>] (do_one_initcall) from [<c04b9ecc>] (kernel_init_freeable+0x168/0x1ac)
[<c04b9ecc>] (kernel_init_freeable) from [<c03b2228>] (kernel_init+0x8/0xf4)
[<c03b2228>] (kernel_init) from [<c00082c0>] (ret_from_fork+0x14/0x34)
Exception stack(0xc441dfb0 to 0xc441dff8)
dfa0: 00000000 00000000 00000000 00000000
dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
Code: e12fff1e e92d4010 e590303c e1a02001 (e5933000)
---[ end trace c914d6030eaa95c8 ]---
Fixes: b809d192eb98 ("rtc: ep93xx: stop setting platform_data")
Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20201201095507.10317-1-nikita.shubin@maquefel.me
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/rtc/rtc-ep93xx.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/rtc/rtc-ep93xx.c b/drivers/rtc/rtc-ep93xx.c index 8ec9ea1ca72e..6f90b85a5814 100644 --- a/drivers/rtc/rtc-ep93xx.c +++ b/drivers/rtc/rtc-ep93xx.c @@ -33,7 +33,7 @@ struct ep93xx_rtc { static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, unsigned short *delete) { - struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); + struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev); unsigned long comp; comp = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP); @@ -51,7 +51,7 @@ static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) { - struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); + struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev); unsigned long time; time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA); @@ -62,7 +62,7 @@ static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) static int ep93xx_rtc_set_time(struct device *dev, struct rtc_time *tm) { - struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); + struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev); unsigned long secs = rtc_tm_to_time64(tm); writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD); |