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programmer_init: Work on a mutable copy of programmer params

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The signature of extract_param() was wrong all the time. It actually
modifies the passed, global `programmer_param` string. This only com-
piled w/o warnings because of a deficiency of the strstr() API. It
takes a const string as argument but returns a mutable pointer to
a substring of it.

As we take a const parameter string in the libflashrom API and should
not change that, we create a copy in programmer_init() instead.

Now that we free our copy of the programmer parameters at the end of
programmer_init() it's more obvious that the string can only be used
during initialization. So also clear `programmer_param` inside
programmer_init() instead of programmer_shutdown().

Change-Id: If6bb2e5e4312b07f756615984bd3757e92b86b0a
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/67094
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Thomas Heijligen <src@posteo.de>
This commit is contained in:
Nico Huber
2022-08-26 11:36:48 +02:00
committed by Angel Pons
parent 869f3f7b2c
commit ca61c3dd3e
1 changed files with 14 additions and 5 deletions
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19
flashrom.c
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@@ -38,7 +38,7 @@ const char flashrom_version[] = FLASHROM_VERSION;
const char *chip_to_probe = NULL;
static const struct programmer_entry *programmer = NULL;
static const char *programmer_param = NULL;
static char *programmer_param = NULL;
/*
* Programmers supporting multiple buses can have differing size limits on
@@ -150,7 +150,16 @@ int programmer_init(const struct programmer_entry *prog, const char *param)
/* Default to allowing writes. Broken programmers set this to 0. */
programmer_may_write = true;
programmer_param = param;
if (param) {
programmer_param = strdup(param);
if (!programmer_param) {
msg_perr("Out of memory!\n");
return ERROR_FATAL;
}
} else {
programmer_param = NULL;
}
msg_pdbg("Initializing %s programmer\n", programmer->name);
ret = programmer->init(NULL);
if (programmer_param && strlen(programmer_param)) {
@@ -169,6 +178,8 @@ int programmer_init(const struct programmer_entry *prog, const char *param)
ret = ERROR_FATAL;
}
}
free(programmer_param);
programmer_param = NULL;
return ret;
}
@@ -187,8 +198,6 @@ int programmer_shutdown(void)
int i = --shutdown_fn_count;
ret |= shutdown_fn[i].func(shutdown_fn[i].data);
}
programmer_param = NULL;
registered_master_count = 0;
return ret;
@@ -227,7 +236,7 @@ int read_memmapped(struct flashctx *flash, uint8_t *buf, unsigned int start,
* needle and remove everything from the first occurrence of needle to the next
* delimiter from haystack.
*/
static char *extract_param(const char *const *haystack, const char *needle, const char *delim)
static char *extract_param(char *const *haystack, const char *needle, const char *delim)
{
char *param_pos, *opt_pos, *rest;
char *opt = NULL;