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-rw-r--r--lib/decompress_unlz4.c65
1 files changed, 43 insertions, 22 deletions
diff --git a/lib/decompress_unlz4.c b/lib/decompress_unlz4.c
index 7d1e83caf8ad..3ad7f3954dfd 100644
--- a/lib/decompress_unlz4.c
+++ b/lib/decompress_unlz4.c
@@ -83,13 +83,20 @@ STATIC inline int INIT unlz4(u8 *input, int in_len,
if (posp)
*posp = 0;
- if (fill)
- fill(inp, 4);
+ if (fill) {
+ size = fill(inp, 4);
+ if (size < 4) {
+ error("data corrupted");
+ goto exit_2;
+ }
+ }
chunksize = get_unaligned_le32(inp);
if (chunksize == ARCHIVE_MAGICNUMBER) {
- inp += 4;
- size -= 4;
+ if (!fill) {
+ inp += 4;
+ size -= 4;
+ }
} else {
error("invalid header");
goto exit_2;
@@ -100,29 +107,44 @@ STATIC inline int INIT unlz4(u8 *input, int in_len,
for (;;) {
- if (fill)
- fill(inp, 4);
+ if (fill) {
+ size = fill(inp, 4);
+ if (size == 0)
+ break;
+ if (size < 4) {
+ error("data corrupted");
+ goto exit_2;
+ }
+ }
chunksize = get_unaligned_le32(inp);
if (chunksize == ARCHIVE_MAGICNUMBER) {
- inp += 4;
- size -= 4;
+ if (!fill) {
+ inp += 4;
+ size -= 4;
+ }
if (posp)
*posp += 4;
continue;
}
- inp += 4;
- size -= 4;
+
if (posp)
*posp += 4;
- if (fill) {
+ if (!fill) {
+ inp += 4;
+ size -= 4;
+ } else {
if (chunksize > lz4_compressbound(uncomp_chunksize)) {
error("chunk length is longer than allocated");
goto exit_2;
}
- fill(inp, chunksize);
+ size = fill(inp, chunksize);
+ if (size < chunksize) {
+ error("data corrupted");
+ goto exit_2;
+ }
}
#ifdef PREBOOT
if (out_len >= uncomp_chunksize) {
@@ -149,18 +171,17 @@ STATIC inline int INIT unlz4(u8 *input, int in_len,
if (posp)
*posp += chunksize;
- size -= chunksize;
+ if (!fill) {
+ size -= chunksize;
- if (size == 0)
- break;
- else if (size < 0) {
- error("data corrupted");
- goto exit_2;
+ if (size == 0)
+ break;
+ else if (size < 0) {
+ error("data corrupted");
+ goto exit_2;
+ }
+ inp += chunksize;
}
-
- inp += chunksize;
- if (fill)
- inp = inp_start;
}
ret = 0;