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Diffstat (limited to 'fs/fat/fat.c')
-rw-r--r--fs/fat/fat.c20
1 files changed, 12 insertions, 8 deletions
diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index 80156c815f..4a60a2503e 100644
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -567,15 +567,16 @@ get_vfatname(fsdata *mydata, int curclust, __u8 *cluster,
}
/* Calculate short name checksum */
-static __u8 mkcksum(const char *str)
+static __u8 mkcksum(const char name[8], const char ext[3])
{
int i;
__u8 ret = 0;
- for (i = 0; i < 11; i++) {
- ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + str[i];
- }
+ for (i = 0; i < sizeof(name); i++)
+ ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + name[i];
+ for (i = 0; i < sizeof(ext); i++)
+ ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + ext[i];
return ret;
}
@@ -678,7 +679,8 @@ static dir_entry *get_dentfromdir(fsdata *mydata, int startsect,
return NULL;
}
#ifdef CONFIG_SUPPORT_VFAT
- if (dols && mkcksum(dentptr->name) == prevcksum) {
+ __u8 csum = mkcksum(dentptr->name, dentptr->ext);
+ if (dols && csum == prevcksum) {
prevcksum = 0xffff;
dentptr++;
continue;
@@ -946,13 +948,16 @@ do_fat_read_at(const char *filename, unsigned long pos, void *buffer,
for (i = 0; i < DIRENTSPERBLOCK; i++) {
char s_name[14], l_name[VFAT_MAXLEN_BYTES];
+ __u8 csum;
l_name[0] = '\0';
if (dentptr->name[0] == DELETED_FLAG) {
dentptr++;
continue;
}
- if ((dentptr->attr & ATTR_VOLUME)) {
+
+ csum = mkcksum(dentptr->name, dentptr->ext);
+ if (dentptr->attr & ATTR_VOLUME) {
#ifdef CONFIG_SUPPORT_VFAT
if ((dentptr->attr & ATTR_VFAT) == ATTR_VFAT &&
(dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
@@ -1015,8 +1020,7 @@ do_fat_read_at(const char *filename, unsigned long pos, void *buffer,
goto exit;
}
#ifdef CONFIG_SUPPORT_VFAT
- else if (dols == LS_ROOT &&
- mkcksum(dentptr->name) == prevcksum) {
+ else if (dols == LS_ROOT && csum == prevcksum) {
prevcksum = 0xffff;
dentptr++;
continue;