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fs/fat/fat32util.c: Fix calculation of current sector with invalid cluster

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If the current cluster is invalid, don't use the error code for calculating
the sector number. Instead just return the error code.

Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>
This commit is contained in:
Jukka Laitinen 2021-05-18 22:39:41 +03:00 committed by Xiang Xiao
parent 65e9ff5a48
commit 105f305b1b
1 changed files with 10 additions and 3 deletions
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13
fs/fat/fs_fat32util.c
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@ -2142,6 +2142,7 @@ int fat_currentsector(struct fat_mountpt_s *fs, struct fat_file_s *ff,
off_t position)
{
int sectoroffset;
off_t cluster_start_sector;
if (position <= ff->ff_size)
{
@ -2149,12 +2150,18 @@ int fat_currentsector(struct fat_mountpt_s *fs, struct fat_file_s *ff,
sectoroffset = SEC_NSECTORS(fs, position) & CLUS_NDXMASK(fs);
/* The current cluster is the first sector of the cluster plus
/* The current sector is the first sector of the cluster plus
* the sector offset
*/
ff->ff_currentsector = fat_cluster2sector(fs, ff->ff_currentcluster)
+ sectoroffset;
cluster_start_sector = fat_cluster2sector(fs, ff->ff_currentcluster);
if (cluster_start_sector < 0)
{
return cluster_start_sector;
}
ff->ff_currentsector = cluster_start_sector + sectoroffset;
/* The remainder is the number of sectors left in the cluster to be
* read/written