brcm63xx: brcm63xxpart: fix buffer overrun in of parser

We never account for the added partitions from the tag parser, so
allocated two partioness less than needed. This can cause issues when
the memory gets reused before the mtd code can actually add the
partitions.

Fixes oopses like:
[    0.920000] mtd: device 2 (rootfs) set to be root filesystem
[    0.924000] 1 squashfs-split partitions found on MTD device rootfs
[    0.932000] 0x0000002e0000-0x0000003f0000 : "rootfs_data"
[    0.940000] 0x000000010000-0x0000003f0000 : "linux"
[    0.948000] CPU 0 Unable to handle kernel paging request at virtual address 00010203, epc == 8028ddf8, ra == 801ad5d4
[    0.956000] Oops[#1]:
[    0.956000] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.18.8 #22
[    0.956000] task: 8181da78 ti: 8181e000 task.ti: 8181e000
[    0.956000] $ 0   : 00000000 10008f00 00010203 81049e40
[    0.956000] $ 4   : 00010203 000000d0 00000000 000000fd
[    0.956000] $ 8   : 00000000 80015490 00000000 80370000
[    0.956000] $12   : 00000000 00000001 00000000 2f736269
[    0.956000] $16   : 00010203 000000d0 8007bde0 81482000
[    0.956000] $20   : 00000000 00000004 81481f80 803c4b78
[    0.956000] $24   : 00000000 00000000
[    0.956000] $28   : 8181e000 8181fbe8 80b20000 801ad5d4
[    0.956000] Hi    : 00000000
[    0.956000] Lo    : 00000000
[    0.956000] epc   : 8028ddf8 strlen+0x4/0x20
[    0.956000]     Not tainted
[    0.956000] ra    : 801ad5d4 kstrdup+0x30/0x84
[    0.956000] Status: 10008f03 KERNEL EXL IE
[    0.956000] Cause : 00800008
[    0.956000] BadVA : 00010203
[    0.956000] PrId  : 0002a010 (Broadcom BMIPS4350)
[    0.956000] Modules linked in:
[    0.956000] Process swapper/0 (pid: 1, threadinfo=8181e000, task=8181da78, tls=00000000)
[    0.956000] Stack : 8148aa00 803c4bcc 00000000 801cd9d0 00000000 8148a400 818a1400 003f0000
          81482000 8007bde0 8148aa00 800ac78c 8148aa00 00000004 8037ae30 8181fc4c
          8148aa00 803bc074 803c0000 80074b84 00000000 00010000 00000004 ffffffff
          8037ae30 00000004 8148aa00 00000004 803c4b80 818a1400 803c0000 00000005
          81481f80 80074ce0 8181fc84 00000005 81879800 8008ece4 00000000 003f0000
          ...
[    0.956000] Call Trace:
[    0.956000] [<8028ddf8>] strlen+0x4/0x20
[    0.956000] [<801ad5d4>] kstrdup+0x30/0x84
[    0.956000] [<8007bde0>] allocate_partition+0x58/0x93c
[    0.956000] [<80074ce0>] add_mtd_partitions+0x90/0x144
[    0.956000] [<801cc228>] mtd_device_parse_register+0x78/0xcc
[    0.956000] [<801e7870>] of_flash_probe+0x658/0x728
[    0.956000] [<80216ee0>] platform_drv_probe+0x24/0x60
[    0.956000] [<801221f4>] driver_probe_device+0xcc/0x214
[    0.956000] [<800466f8>] __driver_attach+0x7c/0xb4
[    0.956000] [<800c38bc>] bus_for_each_dev+0x94/0xa4
[    0.956000] [<800c35e4>] bus_add_driver+0x104/0x1ec
[    0.956000] [<80122400>] driver_register+0xac/0x100
[    0.956000] [<80113a5c>] do_one_initcall+0x148/0x204
[    0.956000] [<803cbd1c>] kernel_init_freeable+0x168/0x220
[    0.956000] [<800157bc>] kernel_init+0x10/0x114
[    0.956000] [<800108a8>] ret_from_kernel_thread+0x14/0x1c
[    0.956000]
[    0.956000]
Code: 03e00008  27bd0028  00801021 <80430000> 10600003  00000000  080a377e  24420001  03e00008
[    1.192000] ---[ end trace 9d89ccbcae27fe40 ]---
[    1.200000] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[    1.200000]
[    1.200000] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@44787 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 15 insertions, 7 deletions

diff --git a/target/linux/brcm63xx/patches-3.18/425-bcm63xxpart_parse_paritions_from_dt.patch b/target/linux/brcm63xx/patches-3.18/425-bcm63xxpart_parse_paritions_from_dt.patch
index 7f3890eb0a..53fc4c5d23 100644
--- a/target/linux/brcm63xx/patches-3.18/425-bcm63xxpart_parse_paritions_from_dt.patch
+++ b/target/linux/brcm63xx/patches-3.18/425-bcm63xxpart_parse_paritions_from_dt.patch
@@ -109,7 +109,7 @@
  		}
  	} else {
  		pr_warn("CFE boot tag CRC invalid (expected %08x, actual %08x)\n",
-@@ -139,16 +108,145 @@ static int bcm63xx_parse_cfe_partitions(
+@@ -139,16 +108,153 @@ static int bcm63xx_parse_cfe_partitions(
  		kernellen = 0;
  		rootfslen = 0;
  		rootfsaddr = 0;
@@ -165,6 +165,16 @@
 +		if (node_has_compatible(pp))
 +			continue;
 +
++		if (!of_get_property(pp, "reg", &len))
++			continue;
++
++		partname = of_get_property(pp, "label", &len);
++		if (!partname)
++			partname = of_get_property(pp, "name", &len);
++
++		if (!strcmp(partname, "linux"))
++			nr_parts += 2;
++
 +		nr_parts++;
 +	}
 +
@@ -182,10 +192,8 @@
 +			continue;
 +
 +		reg = of_get_property(pp, "reg", &len);
-+		if (!reg) {
-+			nr_parts--;
++		if (!reg)
 +			continue;
-+		}
 +
 +		a_cells = of_n_addr_cells(pp);
 +		s_cells = of_n_size_cells(pp);
@@ -262,7 +270,7 @@
  
  	if (caldatalen1 > 0)
  		nrparts++;
-@@ -158,10 +256,8 @@ static int bcm63xx_parse_cfe_partitions(
+@@ -158,10 +264,8 @@ static int bcm63xx_parse_cfe_partitions(
  
  	/* Ask kernel for more memory */
  	parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL);
@@ -274,7 +282,7 @@
  
  	/* Start building partition list */
  	parts[curpart].name = "CFE";
-@@ -169,29 +265,7 @@ static int bcm63xx_parse_cfe_partitions(
+@@ -169,29 +273,7 @@ static int bcm63xx_parse_cfe_partitions(
  	parts[curpart].size = cfelen;
  	curpart++;
  
@@ -305,7 +313,7 @@
  
  	if (caldatalen1 > 0) {
  		if (caldatalen2 > 0)
-@@ -217,25 +291,33 @@ static int bcm63xx_parse_cfe_partitions(
+@@ -217,25 +299,33 @@ static int bcm63xx_parse_cfe_partitions(
  
  	/* Global partition "linux" to make easy firmware upgrade */
  	parts[curpart].name = "linux";