If the blocksize is 1024, count is initialized with 1. Incrementing count
by 8 will never match (count == fs->blksz * 8), and ptr may be
incremented beyond the buffer end if the bitmap is filled. Add the
startblock offset after the loop.

Remove the second loop, as only the first iteration will be done.

Signed-off-by: Stefan Brüns <stefan.bru...@rwth-aachen.de>
---
 fs/ext4/ext4_common.c | 34 ++++++++++++----------------------
 1 file changed, 12 insertions(+), 22 deletions(-)

v3: Patch added to series

diff --git a/fs/ext4/ext4_common.c b/fs/ext4/ext4_common.c
index 362668b..11da6fa 100644
--- a/fs/ext4/ext4_common.c
+++ b/fs/ext4/ext4_common.c
@@ -158,18 +158,12 @@ static int _get_new_inode_no(unsigned char *buffer)
 
 static int _get_new_blk_no(unsigned char *buffer)
 {
-       unsigned char input;
-       int operand, status;
+       int operand;
        int count = 0;
-       int j = 0;
+       int i;
        unsigned char *ptr = buffer;
        struct ext_filesystem *fs = get_fs();
 
-       if (fs->blksz != 1024)
-               count = 0;
-       else
-               count = 1;
-
        while (*ptr == 255) {
                ptr++;
                count += 8;
@@ -177,21 +171,17 @@ static int _get_new_blk_no(unsigned char *buffer)
                        return -1;
        }
 
-       for (j = 0; j < fs->blksz; j++) {
-               input = *ptr;
-               int i = 0;
-               while (i <= 7) {
-                       operand = 1 << i;
-                       status = input & operand;
-                       if (status) {
-                               i++;
-                               count++;
-                       } else {
-                               *ptr |= operand;
-                               return count;
-                       }
+       if (fs->blksz == 1024)
+               count += 1;
+
+       for (i = 0; i <= 7; i++) {
+               operand = 1 << i;
+               if (*ptr & operand) {
+                       count++;
+               } else {
+                       *ptr |= operand;
+                       return count;
                }
-               ptr = ptr + 1;
        }
 
        return -1;
-- 
2.9.3

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