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* stk500v2.c (stk600_xprog_paged_write): Fix a fatal miscalculation 

of the number of bytes to be written which caused a malloc chunk
corruption.


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@778 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
Joerg Wunsch 2008-07-29 08:39:15 +00:00
parent 5d0bfcaf4c
commit 7f29eb67ea
2 changed files with 20 additions and 4 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2008-07-29 Joerg Wunsch <j.gnu@uriah.heep.sax.de>
* stk500v2.c (stk600_xprog_paged_write): Fix a fatal miscalculation
of the number of bytes to be written which caused a malloc chunk
corruption.
2008-07-27 Joerg Wunsch <j.gnu@uriah.heep.sax.de>
First implementation of ATxmega support. By now, only the

18
stk500v2.c
View File

@ -3187,6 +3187,7 @@ static int stk600_xprog_paged_write(PROGRAMMER * pgm, AVRPART * p, AVRMEM * mem,
unsigned int offset;
unsigned char memtype;
int n_bytes_orig = n_bytes;
size_t writesize;
/*
* The XPROG read command supports at most 256 bytes in one
@ -3249,7 +3250,12 @@ static int stk600_xprog_paged_write(PROGRAMMER * pgm, AVRPART * p, AVRMEM * mem,
}
unsigned int chunk;
for (chunk = 0; chunk < page_size; chunk += 256) {
memset(b + 9, 0xff, 256);
if (n_bytes < 256) {
memset(b + 9 + n_bytes, 0xff, 256 - n_bytes);
writesize = n_bytes;
} else {
writesize = 256;
}
b[0] = XPRG_CMD_WRITE_MEM;
b[1] = memtype;
if (chunk + 256 == page_size) {
@ -3263,7 +3269,7 @@ static int stk600_xprog_paged_write(PROGRAMMER * pgm, AVRPART * p, AVRMEM * mem,
b[6] = addr;
b[7] = 1;
b[8] = 0;
memcpy(b + 9, mem->buf + offset, n_bytes);
memcpy(b + 9, mem->buf + offset, writesize);
if (stk600_xprog_command(pgm, b, 256 + 9, 2) < 0) {
fprintf(stderr,
"%s: stk600_xprog_paged_write(): XPRG_CMD_WRITE_MEM failed\n",
@ -3278,12 +3284,16 @@ static int stk600_xprog_paged_write(PROGRAMMER * pgm, AVRPART * p, AVRMEM * mem,
n_bytes -= 256;
}
} else {
if (n_bytes < page_size)
if (n_bytes < page_size) {
/*
* This can easily happen if the input file was not a
* multiple of the page size.
*/
memset(b + 9 + n_bytes, 0xff, page_size - n_bytes);
writesize = n_bytes;
} else {
writesize = page_size;
}
b[0] = XPRG_CMD_WRITE_MEM;
b[1] = memtype;
b[2] = 3; /* erase page | write page */
@ -3293,7 +3303,7 @@ static int stk600_xprog_paged_write(PROGRAMMER * pgm, AVRPART * p, AVRMEM * mem,
b[6] = addr;
b[7] = page_size >> 8;
b[8] = page_size;
memcpy(b + 9, mem->buf + offset, n_bytes);
memcpy(b + 9, mem->buf + offset, writesize);
if (stk600_xprog_command(pgm, b, page_size + 9, 2) < 0) {
fprintf(stderr,
"%s: stk600_xprog_paged_write(): XPRG_CMD_WRITE_MEM failed\n",