Some devices (especially QCA ones) are already using hardcoded partition names with colons in it. The OpenMesh A62 for example provides following mtd relevant information via cmdline:

root=31:11 mtdparts=spi0.0:256k(0:SBL1),128k(0:MIBIB),384k(0:QSEE),64k(0:CDT),64k(0:DDRPARAMS),64k(0:APPSBLENV),512k(0:APPSBL),64k(0:ART),64k(custom),64k(0:KEYS),0x002b0000(kernel),0x00c80000(rootfs),15552k(inactive) rootfsname=rootfs rootwait

The change to split only on the last colon between mtd-id and partitions will cause newpart to see following string for the first partition:

KEYS),0x002b0000(kernel),0x00c80000(rootfs),15552k(inactive)

Such a partition list cannot be parsed and thus the device fails to boot.

Avoid this behavior by making sure that the start of the first part-name ("(") will also be the last byte the mtd-id split algorithm is using for its colon search.

Fixes: eb13fa022741 ("mtd: parser: cmdline: Support MTD names containing one or more colons") Cc: stable@vger.kernel.org Cc: Ron Minnich rminnich@google.com Signed-off-by: Sven Eckelmann sven@narfation.org --- v2:

* switch from net's multi-line comment style to mtd's multiline comment style * Add Ron Minnich as explicit Cc as we are missing his Tested-by

drivers/mtd/parsers/cmdlinepart.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/parsers/cmdlinepart.c b/drivers/mtd/parsers/cmdlinepart.c index a79e4d866b08..0ddff1a4b51f 100644 --- a/drivers/mtd/parsers/cmdlinepart.c +++ b/drivers/mtd/parsers/cmdlinepart.c @@ -226,7 +226,7 @@ static int mtdpart_setup_real(char *s) struct cmdline_mtd_partition *this_mtd; struct mtd_partition *parts; int mtd_id_len, num_parts; - char *p, *mtd_id, *semicol; + char *p, *mtd_id, *semicol, *open_parenth;

/* * Replace the first ';' by a NULL char so strrchr can work @@ -236,6 +236,14 @@ static int mtdpart_setup_real(char *s) if (semicol) *semicol = '\0';

+ /* + * make sure that part-names with ":" will not be handled as + * part of the mtd-id with an ":" + */ + open_parenth = strchr(s, '('); + if (open_parenth) + *open_parenth = '\0'; + mtd_id = s;

/* @@ -245,6 +253,10 @@ static int mtdpart_setup_real(char *s) */ p = strrchr(s, ':');

+ /* Restore the '(' now. */ + if (open_parenth) + *open_parenth = '('; + /* Restore the ';' now. */ if (semicol) *semicol = ';';