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ipq807x: fat: Fix overflow issue

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As per FAT spec, the number of sectors can be more than
clusters, as clusters starts from databegin.
So check cluster overflow against total clusters.

The FAT at present in u-boot lacks a lot, such as
support for long file names, subdir etc.
The mini dump was using more than 8 character name,
changed that one too.

Change-Id: Icfae6d955dd93432b3d33d7c0b9a724382d87185
Signed-off-by: Manoharan Vijaya Raghavan <mraghava@codeaurora.org>
This commit is contained in:
Manoharan Vijaya Raghavan 2019-08-11 17:07:24 +05:30
parent 9a5d372d14
commit 8791ff3dab
3 changed files with 20 additions and 13 deletions
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2
board/qca/arm/common/crashdump.c
View file

@ -373,7 +373,7 @@ static int dump_wlan_segments(struct dumpinfo_t *dumpinfo, int indx)
if (cur_type == QCA_WDT_LOG_DUMP_TYPE_WLAN_MOD_INFO) {
snprintf(wlan_segment_name, sizeof(wlan_segment_name),
"MODULE_INFO.txt");
"MOD_INFO.txt");
wlan_tlv_size = *(uint32_t *)(uintptr_t)tlv_info.size;
} else {
snprintf(wlan_segment_name,

30
fs/fat/fat_write.c
View file

@ -806,21 +806,25 @@ static void fill_dentry(fsdata *mydata, dir_entry *dentptr,
static int check_overflow(fsdata *mydata, __u32 clustnum, loff_t size)
{
__u32 startsect, sect_num, offset;
__u32 total_clusters = 0;
if (clustnum > 0) {
startsect = mydata->data_begin +
clustnum * mydata->clust_size;
} else {
total_clusters = ((total_sector - mydata->rootdir_sect -
mydata->rootdir_size) /
mydata->clust_size) - 3;
/* the last sectors could be orphaned and not belong to any cluster */
if (clustnum >= total_clusters) {
return -1;
} else if (!clustnum) {
startsect = mydata->rootdir_sect;
sect_num = div_u64_rem(size, mydata->sect_size, &offset);
if (offset != 0)
sect_num++;
if (startsect + sect_num > total_sector)
return -1;
}
sect_num = div_u64_rem(size, mydata->sect_size, &offset);
if (offset != 0)
sect_num++;
if (startsect + sect_num > total_sector)
return -1;
return 0;
}
@ -1003,8 +1007,9 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size,
if (mydata->fatsize == 32) {
mydata->data_begin = mydata->rootdir_sect -
(mydata->clust_size * 2);
mydata->rootdir_size = 0;
} else {
int rootdir_size;
__u16 rootdir_size;
rootdir_size = ((bs.dir_entries[1] * (int)256 +
bs.dir_entries[0]) *
@ -1013,6 +1018,7 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size,
mydata->data_begin = mydata->rootdir_sect +
rootdir_size -
(mydata->clust_size * 2);
mydata->rootdir_size = rootdir_size;
}
mydata->fatbufnum = -1;

1
include/fat.h
View file

@ -174,6 +174,7 @@ typedef struct {
__u16 clust_size; /* Size of clusters in sectors */
int data_begin; /* The sector of the first cluster, can be negative */
int fatbufnum; /* Used by get_fatent, init to -1 */
__u16 rootdir_size; /* total sectors in rootdir */
} fsdata;
typedef int (file_detectfs_func)(void);