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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/linux/Makefile
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
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