https://github.com/git/git
Attributes have a field that tracks the position in the `all_attrs` array they're stored inside. This field gets set via `hashmap_get_size` when adding the attribute to the global map of attributes. But while the field is of type `int`, the value returned by `hashmap_get_size` is an `unsigned int`. It can thus happen that the value overflows, where we would now dereference teh `all_attrs` array at an out-of-bounds value. We do have a sanity check for this overflow via an assert that verifies the index matches the new hashmap's size. But asserts are not a proper mechanism to detect against any such overflows as they may not in fact be compiled into production code. Fix this by using an `unsigned int` to track the index and convert the assert to a call `die()`. Reported-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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attr: fix integer overflow with more than INT_MAX macros
#include "git-compat-util.h"
/*
* A merge sort implementation, simplified from the qsort implementation
* by Mike Haertel, which is a part of the GNU C Library.
*/
static void msort_with_tmp(void *b, size_t n, size_t s,
int (*cmp)(const void *, const void *),
char *t)
{
char *tmp;
char *b1, *b2;
size_t n1, n2;
if (n <= 1)
return;
n1 = n / 2;
n2 = n - n1;
b1 = b;
b2 = (char *)b + (n1 * s);
msort_with_tmp(b1, n1, s, cmp, t);
msort_with_tmp(b2, n2, s, cmp, t);
tmp = t;
while (n1 > 0 && n2 > 0) {
if (cmp(b1, b2) <= 0) {
memcpy(tmp, b1, s);
tmp += s;
b1 += s;
--n1;
} else {
memcpy(tmp, b2, s);
tmp += s;
b2 += s;
--n2;
}
}
if (n1 > 0)
memcpy(tmp, b1, n1 * s);
memcpy(b, t, (n - n2) * s);
}
void git_stable_qsort(void *b, size_t n, size_t s,
int (*cmp)(const void *, const void *))
{
const size_t size = st_mult(n, s);
char buf[1024];
if (size < sizeof(buf)) {
/* The temporary array fits on the small on-stack buffer. */
msort_with_tmp(b, n, s, cmp, buf);
} else {
/* It's somewhat large, so malloc it. */
char *tmp = xmalloc(size);
msort_with_tmp(b, n, s, cmp, tmp);
free(tmp);
}
}
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