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50a6c8efa2
If our size computation overflows size_t, we may allocate a much smaller buffer than we expected and overflow it. It's probably impossible to trigger an overflow in most of these sites in practice, but it is easy enough convert their additions and multiplications into overflow-checking variants. This may be fixing real bugs, and it makes auditing the code easier. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
41 lines
862 B
C
41 lines
862 B
C
#include "../git-compat-util.h"
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int gitsetenv(const char *name, const char *value, int replace)
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{
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int out;
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size_t namelen, valuelen;
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char *envstr;
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if (!name || strchr(name, '=') || !value) {
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errno = EINVAL;
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return -1;
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}
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if (!replace) {
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char *oldval = NULL;
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oldval = getenv(name);
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if (oldval) return 0;
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}
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namelen = strlen(name);
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valuelen = strlen(value);
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envstr = malloc(st_add3(namelen, valuelen, 2));
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if (!envstr) {
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errno = ENOMEM;
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return -1;
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}
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memcpy(envstr, name, namelen);
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envstr[namelen] = '=';
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memcpy(envstr + namelen + 1, value, valuelen);
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envstr[namelen + valuelen + 1] = 0;
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out = putenv(envstr);
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/* putenv(3) makes the argument string part of the environment,
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* and changing that string modifies the environment --- which
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* means we do not own that storage anymore. Do not free
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* envstr.
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*/
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return out;
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}
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