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| author | Felix Fietkau <nbd@openwrt.org> | 2007-02-18 13:52:14 +0000 |
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| committer | Felix Fietkau <nbd@openwrt.org> | 2007-02-18 13:52:14 +0000 |
| commit | 912e5867ef2685298e547972d968458f600be969 (patch) | |
| tree | 0579a8c5c5338927bf37d7079e2a84bf8351b5e0 /docs/adding.tex | |
| parent | 9b47712459d0248770fb497960266623217e2fb7 (diff) | |
| download | mtk-20170518-912e5867ef2685298e547972d968458f600be969.zip mtk-20170518-912e5867ef2685298e547972d968458f600be969.tar.gz mtk-20170518-912e5867ef2685298e547972d968458f600be969.tar.bz2 | |
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
SVN-Revision: 6318
Diffstat (limited to 'docs/adding.tex')
0 files changed, 0 insertions, 0 deletions