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mtdparts: fix write through NULL pointer

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The "mtdparts add" command wrote through a NULL pointer - on many
systems this went unnoticed (PowerPC has writable RAM there, some ARM
systems have ROM where a write has no effect), but on arm1136
(i.MX31) it crashed the system.

Add appropriate checks.

Signed-off-by: Wolfgang Denk <wd@denx.de>
This commit is contained in:
Wolfgang Denk 2010-04-28 10:53:47 +02:00
parent 3699c28e6d
commit 2697eff1af
1 changed files with 13 additions and 8 deletions
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21
common/cmd_mtdparts.c
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@ -837,14 +837,16 @@ static int device_parse(const char *const mtd_dev, const char **ret, struct mtd_
u32 offset;
int err = 1;
p = mtd_dev;
*retdev = NULL;
*ret = NULL;
DEBUGF("===device_parse===\n");
assert(retdev);
*retdev = NULL;
if (ret)
*ret = NULL;
/* fetch <mtd-id> */
mtd_id = p;
mtd_id = p = mtd_dev;
if (!(p = strchr(mtd_id, ':'))) {
printf("no <mtd-id> identifier\n");
return 1;
@ -913,12 +915,15 @@ static int device_parse(const char *const mtd_dev, const char **ret, struct mtd_
/* check for next device presence */
if (p) {
if (*p == ';') {
*ret = ++p;
if (ret)
*ret = ++p;
} else if (*p == '\0') {
*ret = p;
if (ret)
*ret = p;
} else {
printf("unexpected character '%c' at the end of device\n", *p);
*ret = NULL;
if (ret)
*ret = NULL;
return 1;
}
}