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| author | Richard Genoud | 2014-06-24 12:12:58 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2014-06-25 16:37:37 +0200 |
| commit | cbf3bfa57a419202c2bc26f3ff8ae21d3d3bf8b2 (patch) | |
| tree | a068db7e2be4e0edeaecead5ca210be0c48001d7 | |
| parent | de3cae1348f212effd3f2838301596d15c6b3e54 (diff) | |
| download | busybox-cbf3bfa57a419202c2bc26f3ff8ae21d3d3bf8b2.zip busybox-cbf3bfa57a419202c2bc26f3ff8ae21d3d3bf8b2.tar.gz | |
nanddump: correct rounding to next page (lead to infinite loop)
The rounding to next page formula was wrong:
ex: (len | ~(meminfo->writesize - 1)) + 1;
len=128K
writesize=4K
(len | ~(meminfo->writesize - 1)) + 1 => 4 294 963 201 ?!
correct rounding formula:
((len - 1) | (meminfo->writesize - 1)) + 1 => 128K
len = 130K
((len - 1) | (meminfo->writesize - 1)) + 1 => 132K
modprobe nandsim parts="20,20" badblocks="22,23"
without patch:
nanddump /dev/mtd1 | wc -c
[...] infinite loop
with the patch:
nanddump /dev/mtd1 | wc -c
327680
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | miscutils/nandwrite.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/miscutils/nandwrite.c b/miscutils/nandwrite.c index e3f9b56..8c4da80 100644 --- a/miscutils/nandwrite.c +++ b/miscutils/nandwrite.c @@ -64,8 +64,8 @@ static void dump_bad(struct mtd_info_user *meminfo, unsigned len, int oob) unsigned char buf[meminfo->writesize]; unsigned count; - /* round len to the next page */ - len = (len | ~(meminfo->writesize - 1)) + 1; + /* round len to the next page only if len is not already on a page */ + len = ((len - 1) | (meminfo->writesize - 1)) + 1; memset(buf, 0xff, sizeof(buf)); for (count = 0; count < len; count += meminfo->writesize) { |