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authornbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>2007-02-18 13:52:14 +0000
committernbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>2007-02-18 13:52:14 +0000
commita7cb17cea9375f522cb87b2d53808e1cfaa713c1 (patch)
tree5a537257117b5d6a0af901cf3fe966100addd352 /target
parent28a667defe73472438d7607d26530cf24b68488e (diff)
Finally fix the pesky x86-2.6 block2mtd related crash (#1058)
When erasing blocks, block2mtd checks the block on the physical disk to see if everything's filled with 0xff. When grabbing a page from the page cache, it initializes the limit as <start address> + PAGE_SIZE. Turns out that the pointer to the status page is (unsigned long *), and thus it adds (PAGE_SIZE * 4). This would never have been caught, if it wasn't for the unlikely event that block2mtd catches the *last* page available in the system ram and thus tries to scan 4 memory pages from there. The absolutely trivial fix is to do a double cast (cast to (u8 *), add PAGE_SIZE, then cast to (unsigned long *)) ... and there was much rejoicing git-svn-id: svn://svn.openwrt.org/openwrt/trunk@6318 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target')
-rw-r--r--target/linux/generic-2.6/patches/212-block2mtd_erase_scan.patch11
1 files changed, 11 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/patches/212-block2mtd_erase_scan.patch b/target/linux/generic-2.6/patches/212-block2mtd_erase_scan.patch
new file mode 100644
index 000000000..76b4f5d4c
--- /dev/null
+++ b/target/linux/generic-2.6/patches/212-block2mtd_erase_scan.patch
@@ -0,0 +1,11 @@
+--- linux.dev/drivers/mtd/devices/block2mtd.c.old 2007-02-18 14:08:59.519952312 +0100
++++ linux.dev/drivers/mtd/devices/block2mtd.c 2007-02-18 14:09:04.219237912 +0100
+@@ -111,7 +111,7 @@
+ if (IS_ERR(page))
+ return PTR_ERR(page);
+
+- max = (u_long*)page_address(page) + PAGE_SIZE;
++ max = (u_long*) ((u8 *) page_address(page) + PAGE_SIZE);
+ for (p=(u_long*)page_address(page); p<max; p++)
+ if (*p != -1UL) {
+ lock_page(page);