The imx23 board will check the fingerprint, so it will call the
mx23_check_transcription_stamp. This function will use @chip->buffers->databuf
as its buffer which is allocated in the nand_scan_tail().
Unfortunately, the mx23_check_transcription_stamp is called before the
nand_scan_tail(). So we will meet a NULL pointer bug:
--------------------------------------------------------------------
[ 1.150000] NAND device: Manufacturer ID: 0xec, Chip ID: 0xd7 (Samsung NAND 4GiB 3,3V 8-bit), 4096MiB, page size: 4096, OOB size: 8
[ 1.160000] Unable to handle kernel NULL pointer dereference at virtual address 000005d0
[ 1.170000] pgd = c0004000
[ 1.170000] [000005d0] *pgd=00000000
[ 1.180000] Internal error: Oops: 5 [#1] ARM
[ 1.180000] Modules linked in:
[ 1.180000] CPU: 0 PID: 1 Comm: swapper Not tainted 3.12.0 #89
[ 1.180000] task: c7440000 ti: c743a000 task.ti: c743a000
[ 1.180000] PC is at memcmp+0x10/0x54
[ 1.180000] LR is at gpmi_nand_probe+0x42c/0x894
[ 1.180000] pc : [<c025fcb0>] lr : [<c02f6a68>] psr: 20000053
[ 1.180000] sp : c743be2c ip : 600000d3 fp : ffffffff
[ 1.180000] r10: 000005d0 r9 : c02f5f08 r8 : 00000000
[ 1.180000] r7 : c75858a8 r6 : c75858a8 r5 : c7585b18 r4 : c7585800
[ 1.180000] r3 : 000005d0 r2 : 00000004 r1 : c05c33e4 r0 : 000005d0
[ 1.180000] Flags: nzCv IRQs on FIQs off Mode SVC_32 ISA ARM Segment kernel
[ 1.180000] Control: 0005317f Table: 40004000 DAC: 00000017
[ 1.180000] Process swapper (pid: 1, stack limit = 0xc743a1c0)
--------------------------------------------------------------------
This patch uses the local array(whose size is 4 bytes) to replace
the referencing of the @chip->buffers->databuf.
Use the macro FINGERPRINT_LEN to avoid the hardcode.
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Fabio Estevam <festevam@xxxxxxxxx>
Signed-off-by: Huang Shijie <b32955@xxxxxxxxxxxxx>
---
drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 7ac2280..d34cc54 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -1343,6 +1343,7 @@ static int nand_boot_set_geometry(struct gpmi_nand_data *this)
}
static const char *fingerprint = "STMP";
+#define FINGERPRINT_LEN 4
static int mx23_check_transcription_stamp(struct gpmi_nand_data *this)
{
struct boot_rom_geometry *rom_geo = &this->rom_geometry;
@@ -1352,7 +1353,7 @@ static int mx23_check_transcription_stamp(struct gpmi_nand_data *this)
unsigned int search_area_size_in_strides;
unsigned int stride;
unsigned int page;
- uint8_t *buffer = chip->buffers->databuf;
+ uint8_t buffer[FINGERPRINT_LEN + 1];
int saved_chip_number;
int found_an_ncb_fingerprint = false;
--
1.7.2.rc3
--
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