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fs/squashfs: sqfs_read: don't write beyond buffer size

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The length of the buffer wasn't taken into account when writing to the
given buffer.

Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
This commit is contained in:
Richard Genoud 2020-11-03 12:11:23 +01:00 committed by Tom Rini
parent 6d25bd3e9c
commit cbd5e40ede
1 changed files with 8 additions and 0 deletions
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8
fs/squashfs/sqfs.c
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@ -1415,6 +1415,8 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
}
finfo.size = len;
} else {
len = finfo.size;
}
if (datablk_count) {
@ -1461,9 +1463,13 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
if (ret)
goto out;
if ((*actread + dest_len) > len)
dest_len = len - *actread;
memcpy(buf + offset + *actread, datablock, dest_len);
*actread += dest_len;
} else {
if ((*actread + table_size) > len)
table_size = len - *actread;
memcpy(buf + offset + *actread, data, table_size);
*actread += table_size;
}
@ -1471,6 +1477,8 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
data_offset += table_size;
free(data_buffer);
data_buffer = NULL;
if (*actread >= len)
break;
}
/*