vfio-pci: Fix multifunction=on

[qemu.git] / block / dmg.c

diff --git a/block/dmg.c b/block/dmg.c
index ac397dc8f75e10ddc8e374b2041c0dd40e7eb2b1..d5e9b1ff0163fb80b4830f5c724b11335ce29149 100644 (file)
--- a/block/dmg.c
+++ b/block/dmg.c
@@ -51,35 +51,56 @@ typedef struct BDRVDMGState {
 
 static int dmg_probe(const uint8_t *buf, int buf_size, const char *filename)
 {
-    int len=strlen(filename);
-    if(len>4 && !strcmp(filename+len-4,".dmg"))
-       return 2;
+    int len;
+
+    if (!filename) {
+        return 0;
+    }
+
+    len = strlen(filename);
+    if (len > 4 && !strcmp(filename + len - 4, ".dmg")) {
+        return 2;
+    }
     return 0;
 }
 
-static off_t read_off(BlockDriverState *bs, int64_t offset)
+static int read_uint64(BlockDriverState *bs, int64_t offset, uint64_t *result)
 {
-       uint64_t buffer;
-       if (bdrv_pread(bs->file, offset, &buffer, 8) < 8)
-               return 0;
-       return be64_to_cpu(buffer);
+    uint64_t buffer;
+    int ret;
+
+    ret = bdrv_pread(bs->file, offset, &buffer, 8);
+    if (ret < 0) {
+        return ret;
+    }
+
+    *result = be64_to_cpu(buffer);
+    return 0;
 }
 
-static off_t read_uint32(BlockDriverState *bs, int64_t offset)
+static int read_uint32(BlockDriverState *bs, int64_t offset, uint32_t *result)
 {
-       uint32_t buffer;
-       if (bdrv_pread(bs->file, offset, &buffer, 4) < 4)
-               return 0;
-       return be32_to_cpu(buffer);
+    uint32_t buffer;
+    int ret;
+
+    ret = bdrv_pread(bs->file, offset, &buffer, 4);
+    if (ret < 0) {
+        return ret;
+    }
+
+    *result = be32_to_cpu(buffer);
+    return 0;
 }
 
-static int dmg_open(BlockDriverState *bs, int flags)
+static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
+                    Error **errp)
 {
     BDRVDMGState *s = bs->opaque;
-    off_t info_begin,info_end,last_in_offset,last_out_offset;
-    uint32_t count;
+    uint64_t info_begin,info_end,last_in_offset,last_out_offset;
+    uint32_t count, tmp;
     uint32_t max_compressed_size=1,max_sectors_per_chunk=1,i;
     int64_t offset;
+    int ret;
 
     bs->read_only = 1;
     s->n_chunks = 0;
@@ -88,21 +109,32 @@ static int dmg_open(BlockDriverState *bs, int flags)
     /* read offset of info blocks */
     offset = bdrv_getlength(bs->file);
     if (offset < 0) {
+        ret = offset;
         goto fail;
     }
     offset -= 0x1d8;
 
-    info_begin = read_off(bs, offset);
-    if (info_begin == 0) {
-       goto fail;
+    ret = read_uint64(bs, offset, &info_begin);
+    if (ret < 0) {
+        goto fail;
+    } else if (info_begin == 0) {
+        ret = -EINVAL;
+        goto fail;
     }
 
-    if (read_uint32(bs, info_begin) != 0x100) {
+    ret = read_uint32(bs, info_begin, &tmp);
+    if (ret < 0) {
+        goto fail;
+    } else if (tmp != 0x100) {
+        ret = -EINVAL;
         goto fail;
     }
 
-    count = read_uint32(bs, info_begin + 4);
-    if (count == 0) {
+    ret = read_uint32(bs, info_begin + 4, &count);
+    if (ret < 0) {
+        goto fail;
+    } else if (count == 0) {
+        ret = -EINVAL;
         goto fail;
     }
     info_end = info_begin + count;
@@ -114,12 +146,20 @@ static int dmg_open(BlockDriverState *bs, int flags)
     while (offset < info_end) {
         uint32_t type;
 
-       count = read_uint32(bs, offset);
-       if(count==0)
-           goto fail;
+        ret = read_uint32(bs, offset, &count);
+        if (ret < 0) {
+            goto fail;
+        } else if (count == 0) {
+            ret = -EINVAL;
+            goto fail;
+        }
         offset += 4;
 
-       type = read_uint32(bs, offset);
+        ret = read_uint32(bs, offset, &type);
+        if (ret < 0) {
+            goto fail;
+        }
+
        if (type == 0x6d697368 && count >= 244) {
            int new_size, chunk_count;
 
@@ -134,8 +174,11 @@ static int dmg_open(BlockDriverState *bs, int flags)
            s->sectors = g_realloc(s->sectors, new_size);
            s->sectorcounts = g_realloc(s->sectorcounts, new_size);
 
-           for(i=s->n_chunks;i<s->n_chunks+chunk_count;i++) {
-               s->types[i] = read_uint32(bs, offset);
+            for (i = s->n_chunks; i < s->n_chunks + chunk_count; i++) {
+                ret = read_uint32(bs, offset, &s->types[i]);
+                if (ret < 0) {
+                    goto fail;
+                }
                offset += 4;
                if(s->types[i]!=0x80000005 && s->types[i]!=1 && s->types[i]!=2) {
                    if(s->types[i]==0xffffffff) {
@@ -149,17 +192,31 @@ static int dmg_open(BlockDriverState *bs, int flags)
                }
                offset += 4;
 
-               s->sectors[i] = last_out_offset+read_off(bs, offset);
-               offset += 8;
-
-               s->sectorcounts[i] = read_off(bs, offset);
-               offset += 8;
-
-               s->offsets[i] = last_in_offset+read_off(bs, offset);
-               offset += 8;
-
-               s->lengths[i] = read_off(bs, offset);
-               offset += 8;
+                ret = read_uint64(bs, offset, &s->sectors[i]);
+                if (ret < 0) {
+                    goto fail;
+                }
+                s->sectors[i] += last_out_offset;
+                offset += 8;
+
+                ret = read_uint64(bs, offset, &s->sectorcounts[i]);
+                if (ret < 0) {
+                    goto fail;
+                }
+                offset += 8;
+
+                ret = read_uint64(bs, offset, &s->offsets[i]);
+                if (ret < 0) {
+                    goto fail;
+                }
+                s->offsets[i] += last_in_offset;
+                offset += 8;
+
+                ret = read_uint64(bs, offset, &s->lengths[i]);
+                if (ret < 0) {
+                    goto fail;
+                }
+                offset += 8;
 
                if(s->lengths[i]>max_compressed_size)
                    max_compressed_size = s->lengths[i];
@@ -173,15 +230,25 @@ static int dmg_open(BlockDriverState *bs, int flags)
     /* initialize zlib engine */
     s->compressed_chunk = g_malloc(max_compressed_size+1);
     s->uncompressed_chunk = g_malloc(512*max_sectors_per_chunk);
-    if(inflateInit(&s->zstream) != Z_OK)
-       goto fail;
+    if(inflateInit(&s->zstream) != Z_OK) {
+        ret = -EINVAL;
+        goto fail;
+    }
 
     s->current_chunk = s->n_chunks;
 
     qemu_co_mutex_init(&s->lock);
     return 0;
+
 fail:
-    return -1;
+    g_free(s->types);
+    g_free(s->offsets);
+    g_free(s->lengths);
+    g_free(s->sectors);
+    g_free(s->sectorcounts);
+    g_free(s->compressed_chunk);
+    g_free(s->uncompressed_chunk);
+    return ret;
 }
 
 static inline int is_sector_in_chunk(BDRVDMGState* s,
@@ -296,15 +363,15 @@ static coroutine_fn int dmg_co_read(BlockDriverState *bs, int64_t sector_num,
 static void dmg_close(BlockDriverState *bs)
 {
     BDRVDMGState *s = bs->opaque;
-    if(s->n_chunks>0) {
-       free(s->types);
-       free(s->offsets);
-       free(s->lengths);
-       free(s->sectors);
-       free(s->sectorcounts);
-    }
-    free(s->compressed_chunk);
-    free(s->uncompressed_chunk);
+
+    g_free(s->types);
+    g_free(s->offsets);
+    g_free(s->lengths);
+    g_free(s->sectors);
+    g_free(s->sectorcounts);
+    g_free(s->compressed_chunk);
+    g_free(s->uncompressed_chunk);
+
     inflateEnd(&s->zstream);
 }