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fsutils/mkmbr/mkmbr.c: fix null pointer access when not all device space is defined in mbr

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argv[argn] is accessed out of range when there are neither four partitions are specified nor the last partition is of auto size.
Add a number of partition variable based on input argument number.

Signed-off-by: Yinzhe Wu <Yinzhe.Wu@sony.com>
Reviewed-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Reviewed-by: Jacky Cao <Jacky.Cao@sony.com>
Tested-by: Yinzhe Wu <Yinzhe.Wu@sony.com>
This commit is contained in:
Windrow14 2024-10-09 13:29:38 +08:00 • committed by Xiang Xiao
parent 57dd7fd03f
commit aed7d2b8a9
1 changed files with 4 additions and 2 deletions
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6
fsutils/mkmbr/mkmbr.c
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@ -111,8 +111,10 @@ int main(int argc, FAR char *argv[])
int argn;
int fd;
int ret;
int nr_part;
if (argc < 4 || argc % 2 != 0)
nr_part = (argc - 2) / 2;
if (argc < 4 || argc % 2 != 0 || nr_part > 4)
{
print_usage();
return EINVAL;
@ -133,7 +135,7 @@ int main(int argc, FAR char *argv[])
next = 1;
bsize = st.st_size / 512;
mbr_init(&mbr);
for (partn = 0; partn < 4 && next < bsize; partn++)
for (partn = 0; partn < nr_part && next < bsize; partn++)
{
argn = 2 * (partn + 1);
if (!strcmp(argv[argn], "auto"))