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From: | Vladimir 'phcoder' Serbinenko |
Subject: | Re: [PATCH] FAT/exFAT: Fix wrong size detection for files > 4GB |
Date: | Wed, 24 Aug 2016 16:08:20 +0000 |
This makes it unsigned from signed. Did you check that no code relies on signedness in fat.c?
From: Carlo Caione <address@hidden>
For exFAT the file size can be > 4GB. The 'grub_fat_data' is still
marking the 'file_size' as grub_ssize_t that is always 32bit when
compiling for i386-pc also when using exFAT.
This is causing a problem when trying to open in loopback a > 4GB file
from an exFAT partition.
Fix this modifying the size of the 'file_size' according to the
MODE_EXFAT define.
Signed-off-by: Carlo Caione <address@hidden>
---
grub-core/fs/fat.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/grub-core/fs/fat.c b/grub-core/fs/fat.c
index 79fe864..d5212c2 100644
--- a/grub-core/fs/fat.c
+++ b/grub-core/fs/fat.c
@@ -183,7 +183,11 @@ struct grub_fat_data
grub_uint32_t num_clusters;
grub_uint8_t attr;
- grub_ssize_t file_size;
+#ifndef MODE_EXFAT
+ grub_uint32_t file_size;
+#else
+ grub_uint64_t file_size;
+#endif
grub_uint32_t file_cluster;
grub_uint32_t cur_cluster_num;
grub_uint32_t cur_cluster;
--
2.7.4
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