diff options
| -rw-r--r-- | fs/fat/fat.c | 8 | ||||
| -rw-r--r-- | include/fat.h | 3 |
2 files changed, 6 insertions, 5 deletions
diff --git a/fs/fat/fat.c b/fs/fat/fat.c index c1e57412d77..49c78ed79ac 100644 --- a/fs/fat/fat.c +++ b/fs/fat/fat.c @@ -352,7 +352,7 @@ get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer, newclust = get_fatent(mydata, endclust); if((newclust -1)!=endclust) goto getit; - if (newclust <= 0x0001 || newclust >= 0xfff0) { + if (CHECK_CLUST(newclust, mydata->fatsize)) { FAT_DPRINT("curclust: 0x%x\n", newclust); FAT_DPRINT("Invalid FAT entry\n"); return gotsize; @@ -387,7 +387,7 @@ getit: filesize -= actsize; buffer += actsize; curclust = get_fatent(mydata, endclust); - if (curclust <= 0x0001 || curclust >= 0xfff0) { + if (CHECK_CLUST(curclust, mydata->fatsize)) { FAT_DPRINT("curclust: 0x%x\n", curclust); FAT_ERROR("Invalid FAT entry\n"); return gotsize; @@ -459,7 +459,7 @@ get_vfatname(fsdata *mydata, int curclust, __u8 *cluster, slotptr--; curclust = get_fatent(mydata, curclust); - if (curclust <= 0x0001 || curclust >= 0xfff0) { + if (CHECK_CLUST(curclust, mydata->fatsize)) { FAT_DPRINT("curclust: 0x%x\n", curclust); FAT_ERROR("Invalid FAT entry\n"); return -1; @@ -652,7 +652,7 @@ static dir_entry *get_dentfromdir (fsdata * mydata, int startsect, return retdent; } curclust = get_fatent (mydata, curclust); - if (curclust <= 0x0001 || curclust >= 0xfff0) { + if (CHECK_CLUST(curclust, mydata->fatsize)) { FAT_DPRINT ("curclust: 0x%x\n", curclust); FAT_ERROR ("Invalid FAT entry\n"); return NULL; diff --git a/include/fat.h b/include/fat.h index 92638d535e4..f993ccab1c2 100644 --- a/include/fat.h +++ b/include/fat.h @@ -111,7 +111,8 @@ #define START(dent) (FAT2CPU16((dent)->start) \ + (mydata->fatsize != 32 ? 0 : \ (FAT2CPU16((dent)->starthi) << 16))) - +#define CHECK_CLUST(x, fatsize) ((x) <= 1 || \ + (x) >= ((fatsize) != 32 ? 0xfff0 : 0xffffff0)) typedef struct boot_sector { __u8 ignored[3]; /* Bootstrap code */ |