author: Namjae Jeon <namjae.jeon@samsung.com> 2021-06-11 09:40:24 +0900
committer: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 2021-07-14 17:07:48 +0200
commit: 646efb94462b253112a1afaa25ff1be7680f9414
parent: 43661346eb2629fa46811bd894d9d7973cd8d43f
Commit Summary:
Diffstat:
1 file changed, 5 insertions, 3 deletions
diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c
index c4523648472a..cb1c0d8c1714 100644
--- a/fs/exfat/dir.c
+++ b/fs/exfat/dir.c
@@ -63,7 +63,7 @@ static void exfat_get_uniname_from_ext_entry(struct super_block *sb,
static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_entry *dir_entry)
{
int i, dentries_per_clu, dentries_per_clu_bits = 0, num_ext;
- unsigned int type, clu_offset;
+ unsigned int type, clu_offset, max_dentries;
sector_t sector;
struct exfat_chain dir, clu;
struct exfat_uni_name uni_name;
@@ -86,6 +86,8 @@ static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_ent
dentries_per_clu = sbi->dentries_per_clu;
dentries_per_clu_bits = ilog2(dentries_per_clu);
+ max_dentries = (unsigned int)min_t(u64, MAX_EXFAT_DENTRIES,
+ (u64)sbi->num_clusters << dentries_per_clu_bits);
clu_offset = dentry >> dentries_per_clu_bits;
exfat_chain_dup(&clu, &dir);
@@ -109,7 +111,7 @@ static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_ent
}
}
- while (clu.dir != EXFAT_EOF_CLUSTER) {
+ while (clu.dir != EXFAT_EOF_CLUSTER && dentry < max_dentries) {
i = dentry & (dentries_per_clu - 1);
for ( ; i < dentries_per_clu; i++, dentry++) {
@@ -245,7 +247,7 @@ static int exfat_iterate(struct file *filp, struct dir_context *ctx)
if (err)
goto unlock;
get_new:
- if (cpos >= i_size_read(inode))
+ if (ei->flags == ALLOC_NO_FAT_CHAIN && cpos >= i_size_read(inode))
goto end_of_dir;
err = exfat_readdir(inode, &cpos, &de);