mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 10:40:15 +02:00
e4aa7ca5a2
Impact: Bugfix, avoids kernels which build but panic on boot Fix a bug in decompress.c : only scanned until the first non-configured compressor (with disastrous result especially if that was gzip.) Signed-off-by: Alain Knaff <alain@knaff.lu> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
/*
|
|
* decompress.c
|
|
*
|
|
* Detect the decompression method based on magic number
|
|
*/
|
|
|
|
#include <linux/decompress/generic.h>
|
|
|
|
#include <linux/decompress/bunzip2.h>
|
|
#include <linux/decompress/unlzma.h>
|
|
#include <linux/decompress/inflate.h>
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
|
|
#ifndef CONFIG_DECOMPRESS_GZIP
|
|
# define gunzip NULL
|
|
#endif
|
|
#ifndef CONFIG_DECOMPRESS_BZIP2
|
|
# define bunzip2 NULL
|
|
#endif
|
|
#ifndef CONFIG_DECOMPRESS_LZMA
|
|
# define unlzma NULL
|
|
#endif
|
|
|
|
static const struct compress_format {
|
|
unsigned char magic[2];
|
|
const char *name;
|
|
decompress_fn decompressor;
|
|
} compressed_formats[] = {
|
|
{ {037, 0213}, "gzip", gunzip },
|
|
{ {037, 0236}, "gzip", gunzip },
|
|
{ {0x42, 0x5a}, "bzip2", bunzip2 },
|
|
{ {0x5d, 0x00}, "lzma", unlzma },
|
|
{ {0, 0}, NULL, NULL }
|
|
};
|
|
|
|
decompress_fn decompress_method(const unsigned char *inbuf, int len,
|
|
const char **name)
|
|
{
|
|
const struct compress_format *cf;
|
|
|
|
if (len < 2)
|
|
return NULL; /* Need at least this much... */
|
|
|
|
for (cf = compressed_formats; cf->name; cf++) {
|
|
if (!memcmp(inbuf, cf->magic, 2))
|
|
break;
|
|
|
|
}
|
|
if (name)
|
|
*name = cf->name;
|
|
return cf->decompressor;
|
|
}
|