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-rw-r--r--package/system/mtd/src/seama.c46
1 files changed, 18 insertions, 28 deletions
diff --git a/package/system/mtd/src/seama.c b/package/system/mtd/src/seama.c
index dac5da2b85..e3c0e4d51e 100644
--- a/package/system/mtd/src/seama.c
+++ b/package/system/mtd/src/seama.c
@@ -51,49 +51,30 @@ ssize_t pread(int fd, void *buf, size_t count, off_t offset);
ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
int
-seama_fix_md5(struct seama_entity_header *shdr, int fd, size_t len, size_t block_offset)
+seama_fix_md5(struct seama_entity_header *shdr, int fd, size_t data_offset, size_t data_size)
{
char *buf;
- char *data;
ssize_t res;
- size_t msize;
- size_t isize;
MD5_CTX ctx;
unsigned char digest[16];
int i;
int err = 0;
- if (len < sizeof(struct seama_entity_header))
- return -1;
-
- buf = malloc(len);
+ buf = malloc(data_size);
if (!buf) {
err = -ENOMEM;
goto err_out;
}
- res = pread(fd, buf, len, block_offset);
- if (res != len) {
+ res = pread(fd, buf, data_size, data_offset);
+ if (res != data_size) {
perror("pread");
err = -EIO;
goto err_free;
}
- isize = ntohl(shdr->size);
- msize = ntohs(shdr->metasize);
- if (isize == 0) {
- /* the image contains no checksum */
- return -1;
- }
-
- len -= sizeof(struct seama_entity_header) + msize;
- if (isize > len)
- isize = len;
-
- data = buf + sizeof(struct seama_entity_header) + msize;
-
MD5_Init(&ctx);
- MD5_Update(&ctx, data, isize);
+ MD5_Update(&ctx, buf, data_size);
MD5_Final(digest, &ctx);
if (!memcmp(digest, shdr->md5, sizeof(digest))) {
@@ -103,7 +84,7 @@ seama_fix_md5(struct seama_entity_header *shdr, int fd, size_t len, size_t block
}
if (quiet < 2) {
- fprintf(stderr, "new size:%u, new MD5: ", isize);
+ fprintf(stderr, "new size:%u, new MD5: ", data_size);
for (i = 0; i < sizeof(digest); i++)
fprintf(stderr, "%02x", digest[i]);
@@ -111,7 +92,7 @@ seama_fix_md5(struct seama_entity_header *shdr, int fd, size_t len, size_t block
}
/* update the size in the image */
- shdr->size = htonl(isize);
+ shdr->size = htonl(data_size);
/* update the checksum in the image */
memcpy(shdr->md5, digest, sizeof(digest));
@@ -129,6 +110,8 @@ mtd_fixseama(const char *mtd, size_t offset)
char *first_block;
ssize_t res;
size_t block_offset;
+ size_t data_offset;
+ size_t data_size;
struct seama_entity_header *shdr;
if (quiet < 2)
@@ -162,13 +145,20 @@ mtd_fixseama(const char *mtd, size_t offset)
exit(1);
}
- shdr = (struct seama_entity_header *)first_block;
+ shdr = (struct seama_entity_header *)(first_block + offset);
if (shdr->magic != htonl(SEAMA_MAGIC)) {
fprintf(stderr, "No SEAMA header found\n");
return -1;
+ } else if (!ntohl(shdr->size)) {
+ fprintf(stderr, "Seama entity with empty image\n");
+ exit(1);
}
- if (seama_fix_md5(shdr, fd, mtdsize, block_offset))
+ data_offset = offset + sizeof(struct seama_entity_header) + ntohs(shdr->metasize);
+ data_size = mtdsize - data_offset;
+ if (data_size > ntohl(shdr->size))
+ data_size = ntohl(shdr->size);
+ if (seama_fix_md5(shdr, fd, data_offset, data_size))
goto out;
if (mtd_erase_block(fd, block_offset)) {