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vvfat: Fix usage of `info.file.offset` 

The field is marked as "the offset in the file (in clusters)", but it
was being used like this
`cluster_size*(nums)+mapping->info.file.offset`, which is incorrect.

Signed-off-by: Amjad Alsharafi <amjadsharafi10@gmail.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <72f19a7903886dda1aa78bcae0e17702ee939262.1721470238.git.amjadsharafi10@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Amjad Alsharafi 2024-07-20 18:13:31 +08:00 committed by Kevin Wolf
parent b881cf00c9
commit 21b25a0e46
1 changed files with 7 additions and 4 deletions
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11
block/vvfat.c
View File

@ -1408,7 +1408,9 @@ read_cluster_directory:
assert(s->current_fd);
offset=s->cluster_size*(cluster_num-s->current_mapping->begin)+s->current_mapping->info.file.offset;
offset = s->cluster_size *
((cluster_num - s->current_mapping->begin)
+ s->current_mapping->info.file.offset);
if(lseek(s->current_fd, offset, SEEK_SET)!=offset)
return -3;
s->cluster=s->cluster_buffer;
@ -1929,8 +1931,9 @@ get_cluster_count_for_direntry(BDRVVVFATState* s, direntry_t* direntry, const ch
(mapping->mode & MODE_DIRECTORY) == 0) {
/* was modified in qcow */
if (offset != mapping->info.file.offset + s->cluster_size
* (cluster_num - mapping->begin)) {
if (offset != s->cluster_size
* ((cluster_num - mapping->begin)
+ mapping->info.file.offset)) {
/* offset of this cluster in file chain has changed */
abort();
copy_it = 1;
@ -2404,7 +2407,7 @@ static int commit_mappings(BDRVVVFATState* s,
(mapping->end - mapping->begin);
} else
next_mapping->info.file.offset = mapping->info.file.offset +
mapping->end - mapping->begin;
(mapping->end - mapping->begin);
mapping = next_mapping;
}