mirror of
https://github.com/openwrt/openwrt.git
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62 lines
2.0 KiB
Diff
62 lines
2.0 KiB
Diff
Redboot supports storing the FIS directory and the RedBoot
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configuration information in the same block of flash memory. This is
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not the most common RedBoot configuration, but it is used on
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commercially available boards supported by the kernel.
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A recent patch to mtd/redboot.c (http://lkml.org/lkml/2006/3/20/410)
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which corrected the skipping of deleted table entries has exposed the
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latent problem of the kernel redboot parser running off the end of the
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FIS directory and interpreting the RedBoot configuration information
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as table entries.
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This patch terminates the table parsing when the first truly empty
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entry is found (table entry deletion only clears the first byte of the
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name, so two cleared bytes in a row indicates the end of the table),
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thereby supporting the combined redboot FIS directory and RedBoot
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configuration information flash layout scenario.
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Signed-off-by: Rod Whitby <rod@whitby.id.au>
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--
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Index: linux-2.6.19/drivers/mtd/redboot.c
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===================================================================
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--- linux-2.6.19.orig/drivers/mtd/redboot.c
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+++ linux-2.6.19/drivers/mtd/redboot.c
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@@ -96,7 +96,19 @@ static int parse_redboot_partitions(stru
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*/
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if (swab32(buf[i].size) == master->erasesize) {
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int j;
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- for (j = 0; j < numslots && buf[j].name[0] != 0xff; ++j) {
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+ for (j = 0; j < numslots; ++j) {
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+
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+ /* A single 0xff denotes a deleted entry.
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+ * Two of them in a row is the end of the table.
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+ */
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+ if (buf[j].name[0] == 0xff) {
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+ if (buf[j].name[1] == 0xff) {
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+ break;
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+ } else {
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+ continue;
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+ }
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+ }
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+
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/* The unsigned long fields were written with the
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* wrong byte sex, name and pad have no byte sex.
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*/
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@@ -123,8 +135,13 @@ static int parse_redboot_partitions(stru
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for (i = 0; i < numslots; i++) {
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struct fis_list *new_fl, **prev;
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- if (buf[i].name[0] == 0xff)
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- continue;
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+ if (buf[i].name[0] == 0xff) {
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+ if (buf[i].name[1] == 0xff) {
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+ break;
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+ } else {
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+ continue;
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+ }
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+ }
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if (!redboot_checksum(&buf[i]))
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break;
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