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-rw-r--r--lib/libmtd.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/lib/libmtd.c b/lib/libmtd.c
index e0c0934..418ba29 100644
--- a/lib/libmtd.c
+++ b/lib/libmtd.c
@@ -1079,7 +1079,7 @@ int do_oob_op(libmtd_t desc, const struct mtd_dev_info *mtd, int fd,
uint64_t start, uint64_t length, void *data, unsigned int cmd64,
unsigned int cmd)
{
- int ret;
+ int ret, oob_offs;
struct mtd_oob_buf64 oob64;
struct mtd_oob_buf oob;
unsigned long long max_offs;
@@ -1102,10 +1102,13 @@ int do_oob_op(libmtd_t desc, const struct mtd_dev_info *mtd, int fd,
errno = EINVAL;
return -1;
}
- if (start % mtd->min_io_size) {
- errmsg("unaligned address %llu, mtd%d page size is %d",
- (unsigned long long)start, mtd->mtd_num,
- mtd->min_io_size);
+
+ oob_offs = start & (mtd->min_io_size - 1);
+ if (oob_offs + length > mtd->oob_size || length == 0) {
+ errmsg("Cannot write %llu OOB bytes to address %llu "
+ "(OOB offset %u) - mtd%d OOB size is only %d bytes",
+ (unsigned long long)length, (unsigned long long)start,
+ oob_offs, mtd->mtd_num, mtd->oob_size);
errno = EINVAL;
return -1;
}