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oofatfs: bound CREATE_LINKMAP FAT chain walk #13

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Merged
doc-hex merged 1 commit into from
Aug 26, 2026
Merged

oofatfs: bound CREATE_LINKMAP FAT chain walk #13

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5 changes: 3 additions & 2 deletions lib/oofatfs/ff.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4116,7 +4116,7 @@ FRESULT f_lseek (
DWORD clst, bcs, nsect;
FSIZE_t ifptr;
#if FF_USE_FASTSEEK
DWORD cl, pcl, ncl, tcl, dsc, tlen, ulen, *tbl;
DWORD cl, pcl, ncl, nclst, tcl, dsc, tlen, ulen, *tbl;
#endif

res = validate(&fp->obj, &fs); /* Check validity of the file object */
Expand All @@ -4132,14 +4132,15 @@ FRESULT f_lseek (
if (fp->cltbl) { /* Fast seek */
if (ofs == CREATE_LINKMAP) { /* Create CLMT */
tbl = fp->cltbl;
tlen = *tbl++; ulen = 2; /* Given table size and required table size */
tlen = *tbl++; ulen = 2; nclst = 0; /* Given table size and required table size */
cl = fp->obj.sclust; /* Origin of the chain */
if (cl != 0) {
do {
/* Get a fragment */
tcl = cl; ncl = 0; ulen += 2; /* Top, length and used items */
do {
pcl = cl; ncl++;
if (++nclst > fs->n_fatent) ABORT(fs, FR_INT_ERR); /* Abort a cyclic chain */
cl = get_fat(&fp->obj, cl);
if (cl <= 1) ABORT(fs, FR_INT_ERR);
if (cl == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
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