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authorCarl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>2010-11-05 14:51:59 +0000
committerCarl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>2010-11-05 14:51:59 +0000
commit12d6d821416436cf3ede3dbabcd688887ef7ba76 (patch)
tree68176724cdd3d607fa489ca9b2ce590cd8f64584 /flashrom.c
parent6e2ea32dc217329f4321dea0cda1132203e96f04 (diff)
downloadast2050-flashrom-12d6d821416436cf3ede3dbabcd688887ef7ba76.zip
ast2050-flashrom-12d6d821416436cf3ede3dbabcd688887ef7ba76.tar.gz
Fix two memory leaks in doit() and refine get_next_write()
Avoid two memory leaks in doit() which were unproblematic for flashrom because flashrom terminates after finishing doit(). Rename oldcontents to curconents in erase_and_write_block_helper(). Unify the code for all granularities in get_next_write(). Return write length from get_next_write() instead of filling it as referenced parameter. Thanks to Michael Karcher for pointing out the first two issues. Thanks to David Hendricks for pointing out the third issue and suggesting a way to unify that code. Corresponding to flashrom svn r1225. Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> Acked-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>
Diffstat (limited to 'flashrom.c')
-rw-r--r--flashrom.c144
1 files changed, 63 insertions, 81 deletions
diff --git a/flashrom.c b/flashrom.c
index 7af221a..4fc8fca 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -869,81 +869,62 @@ int need_erase(uint8_t *have, uint8_t *want, int len, enum write_granularity gra
* @want buffer with desired content
* @len length of the checked area
* @gran write granularity (enum, not count)
- * @return 0 if no write is needed, 1 otherwise
- * @first_start offset of the first byte which needs to be written
- * @first_len length of the first contiguous area which needs to be written
+ * @first_start offset of the first byte which needs to be written (passed in
+ * value is increased by the offset of the first needed write
+ * relative to have/want or unchanged if no write is needed)
+ * @return length of the first contiguous area which needs to be written
+ * 0 if no write is needed
*
* FIXME: This function needs a parameter which tells it about coalescing
* in relation to the max write length of the programmer and the max write
* length of the chip.
*/
static int get_next_write(uint8_t *have, uint8_t *want, int len,
- int *first_start, int *first_len,
- enum write_granularity gran)
+ int *first_start, enum write_granularity gran)
{
- int result = 0, rel_start = 0;
- int i, limit;
+ int need_write = 0, rel_start = 0, first_len = 0;
+ int i, limit, stride;
- /* The passed in variable might be uninitialized. */
- *first_len = 0;
switch (gran) {
case write_gran_1bit:
case write_gran_1byte:
- for (i = 0; i < len; i++) {
- if (have[i] != want[i]) {
- if (!result) {
- /* First location where have and want
- * differ.
- */
- result = 1;
- rel_start = i;
- }
- } else {
- if (result) {
- /* First location where have and want
- * do not differ anymore.
- */
- *first_len = i - rel_start;
- break;
- }
- }
- }
- /* Did the loop terminate without setting first_len? */
- if (result && ! *first_len)
- *first_len = i - rel_start;
+ stride = 1;
break;
case write_gran_256bytes:
- for (i = 0; i < len / 256; i++) {
- limit = min(256, len - i * 256);
- /* Are 'have' and 'want' identical? */
- if (memcmp(have + i * 256, want + i * 256, limit)) {
- if (!result) {
- /* First location where have and want
- * differ.
- */
- result = 1;
- rel_start = i * 256;
- }
- } else {
- if (result) {
- /* First location where have and want
- * do not differ anymore.
- */
- *first_len = i * 256 - rel_start;
- break;
- }
- }
- }
- /* Did the loop terminate without setting first_len? */
- if (result && ! *first_len)
- *first_len = min(i * 256 - rel_start, len);
+ stride = 256;
break;
default:
msg_cerr("%s: Unsupported granularity! Please report a bug at "
"flashrom@flashrom.org\n", __func__);
+ /* Claim that no write was needed. A write with unknown
+ * granularity is too dangerous to try.
+ */
+ return 0;
}
+ for (i = 0; i < len / stride; i++) {
+ limit = min(stride, len - i * stride);
+ /* Are 'have' and 'want' identical? */
+ if (memcmp(have + i * stride, want + i * stride, limit)) {
+ if (!need_write) {
+ /* First location where have and want differ. */
+ need_write = 1;
+ rel_start = i * stride;
+ }
+ } else {
+ if (need_write) {
+ /* First location where have and want
+ * do not differ anymore.
+ */
+ first_len = i * stride - rel_start;
+ break;
+ }
+ }
+ }
+ /* Did the loop terminate without setting first_len? */
+ if (need_write && ! first_len)
+ first_len = min(i * stride - rel_start, len);
*first_start += rel_start;
- return result;
+ return first_len;
}
/* This function generates various test patterns useful for testing controller
@@ -1370,7 +1351,7 @@ static int selfcheck_eraseblocks(struct flashchip *flash)
static int erase_and_write_block_helper(struct flashchip *flash,
unsigned int start, unsigned int len,
- uint8_t *oldcontents,
+ uint8_t *curcontents,
uint8_t *newcontents,
int (*erasefn) (struct flashchip *flash,
unsigned int addr,
@@ -1383,26 +1364,26 @@ static int erase_and_write_block_helper(struct flashchip *flash,
int writecount = 0;
enum write_granularity gran = write_gran_256bytes; /* FIXME */
- /* oldcontents and newcontents are opaque to walk_eraseregions, and
+ /* curcontents and newcontents are opaque to walk_eraseregions, and
* need to be adjusted here to keep the impression of proper abstraction
*/
- oldcontents += start;
+ curcontents += start;
newcontents += start;
msg_cdbg(":");
/* FIXME: Assume 256 byte granularity for now to play it safe. */
- if (need_erase(oldcontents, newcontents, len, gran)) {
+ if (need_erase(curcontents, newcontents, len, gran)) {
msg_cdbg("E");
ret = erasefn(flash, start, len);
if (ret)
return ret;
- /* Erase was successful. Adjust oldcontents. */
- memset(oldcontents, 0xff, len);
+ /* Erase was successful. Adjust curcontents. */
+ memset(curcontents, 0xff, len);
skip = 0;
}
- while (get_next_write(oldcontents + starthere,
- newcontents + starthere,
- len - starthere, &starthere,
- &lenhere, gran)) {
+ /* get_next_write() sets starthere to a new value after the call. */
+ while ((lenhere = get_next_write(curcontents + starthere,
+ newcontents + starthere,
+ len - starthere, &starthere, gran))) {
if (!writecount++)
msg_cdbg("W");
/* Needs the partial write function signature. */
@@ -1796,8 +1777,8 @@ int doit(struct flashchip *flash, int force, char *filename, int read_it, int wr
if (chip_safety_check(flash, force, filename, read_it, write_it, erase_it, verify_it)) {
msg_cerr("Aborting.\n");
- programmer_shutdown();
- return 1;
+ ret = 1;
+ goto out_nofree;
}
/* Given the existence of read locks, we want to unlock for read,
@@ -1808,8 +1789,7 @@ int doit(struct flashchip *flash, int force, char *filename, int read_it, int wr
if (read_it) {
ret = read_flash_to_file(flash, filename);
- programmer_shutdown();
- return ret;
+ goto out_nofree;
}
oldcontents = (uint8_t *) malloc(size);
@@ -1835,14 +1815,13 @@ int doit(struct flashchip *flash, int force, char *filename, int read_it, int wr
emergency_help_message();
ret = 1;
}
- programmer_shutdown();
- return ret;
+ goto out;
}
if (write_it || verify_it) {
if (read_buf_from_file(newcontents, size, filename)) {
- programmer_shutdown();
- return 1;
+ ret = 1;
+ goto out;
}
#if CONFIG_INTERNAL == 1
@@ -1859,8 +1838,8 @@ int doit(struct flashchip *flash, int force, char *filename, int read_it, int wr
*/
msg_cdbg("Reading old flash chip contents...\n");
if (flash->read(flash, oldcontents, 0, size)) {
- programmer_shutdown();
- return 1;
+ ret = 1;
+ goto out;
}
// This should be moved into each flash part's code to do it
@@ -1878,13 +1857,13 @@ int doit(struct flashchip *flash, int force, char *filename, int read_it, int wr
msg_cinfo("Good. It seems nothing was "
"changed.\n");
nonfatal_help_message();
- programmer_shutdown();
- return 1;
+ ret = 1;
+ goto out;
}
}
emergency_help_message();
- programmer_shutdown();
- return 1;
+ ret = 1;
+ goto out;
}
}
@@ -1900,7 +1879,10 @@ int doit(struct flashchip *flash, int force, char *filename, int read_it, int wr
emergency_help_message();
}
+out:
+ free(oldcontents);
+ free(newcontents);
+out_nofree:
programmer_shutdown();
-
return ret;
}
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